La Plata is only an iconic thing because anglos don't know Latin American history, it was literally created because back in HOI2 you had a limited amount of tags so some minnor countries like Uruguay and Paraguay were recycled to other purposes. Also nobody in Uruguay would support joining Argentina, less one that is a dictatorship.I think the question here is that with all the reworks and removal of existing plot lines, at what point does TNO stops being TNO, and instead being 'WI Axis won WW2 TL number 236'?
Perhaps Kaiserreich have it much easier in that regard, due to WW1 ATLs not being as common, meaning that as long as you keep a victorious German Empire around, even with the removal of iconic elements like the AOG controlled Southern China , La Plata, Genghis Khan II's new Mongol Empire, Lawrence of Britannia, President Curtis avoiding the Second US Civil War, President Kerensky's assassination throwing Russia into a political free-for-all, etc, the KR TL is still recognisably unique... Though I would argue that if syndicalism as the dominate far-left ideology or the continued existence of the Entente operating in exile gets removed, that WOULD be a bridge too far in making Kaiserreich no longer Kaiserreich.
For TNO, however.... Lets be honest, 'Nazis won WW2' ATLs are dime-a-dozen, to the point of being THE default alternate history TL in popular culture, right alongside 'If the Confederates won the American Civil War'. Meaning that in order for TNO to be recognisably unique, it NEEDS to maintain its own niche, to make it different from say... "The Anglo/American – Nazi War", "Fatherland", "The Man in the High Castle", "Wolfenstein", "Thousand Week Reich", etc.
I would argue that at its core, TNO's niche would be, 'If the Axis powers were able to inexplicably maintain the same lucky strike that in OTL, enabled them to defeat France in 6 weeks, make as much headway against the Soviets as they did during Operation Babarosa, and for Japan to overrun Singapore and the Philippines with relative ease... But for reality to ensue when said plot armor suddenly wear off the moment they won WW2, resulting in their regimes getting slowly crushed under the weight of their own inherent issues that prevented them from winning WW2 in OTL'.
Hence, it can be argued that even with Atlantropa and the German Civil War removed, as long as the victorious Axis powers still suffer from the weight of their own self-inflicted problems, TNO with all the 'unrealistic' elements removed will still be TNO... However, at the moment, I feel that a TNO without the German Civil War might as well be a Kaiserreich without syndicalism... Or even a Kaiserreich in which instead of falling to a leftist revolution, Britain became a fascist republic.... With it being so removed from the original material that you might as well create your own TL instead of reworking the existing one.
But I guess we will wait and see if this rework will actually be carried out, and if the devs can pull this off...
Atlantropa was not erased because "realism" it was erased because it brought problems to the Balkan and Turkey teams (because how in the hell do you determine the borders in things like islands) and because ultimately the mod didn't account for Alantropa. Like the Mediterranean countries didn't have a mechanic of "holy shit, we have lost all of our ports, we need to rebuild them, also our economy is being hurt", so if it doesn't impact the game at all, why have it?
Same thing with the US lore changes, TNO USA said that the New Deal didn't happen but it didn't want to account for how the American political system would have changed without it, so Mango decided to brought FDR back, if at the end of the day it didn't change anything.
In general I find that the "realism" complains have no merit, like people who complain about the Commune of France or Germany being reworked in KR, what devs are doing now is trying to study politics, movements and other things before deving. "Wikipedia deving" generates things like KR Uruguay which are horrible.
I think that TNO is characterized as the realistic Axis winning WW2 scenario, because it was a change from back the media was back in the day, but the three-sides cold war for me is more iconic that the German Civil War. If the Russian warlords were to be removed then I would agree with the "soul of TNO arguments", because TNO Russia is one of the elements which set TNO apart.
I am biased for saying this (Uruguayan and TNO dev), but for me now TNO is great because of its South America, is the best representation of the continent in any HOI4 mod. Its devs actively do the leg work to do research and check primary sources to see what interesting things they can add. Adhemar de Barros being elected in Brazil or Frondizi surviving in Argentina are unrealistic, but they are interesting scenarios and stories and the lore for those scenarios has been well-researched by its devs.