Yes , I will look at You with a straight face and say that I do try hard compared with the vast majority of people my age.
I wouldn't worry too much about it. I'd say you're pretty understandable.
Anywho, I'd say you actually have the answer to your question-and the answer is, unfortunately, "not much changes"-Europe still moves on the Americas in a few decades at most and quite possibly within a decade, and disease still decimates the Native Americans and in most places this will pave the way for European conquest to proceed much like OTL.
Now that said, there's a few places where those extra years could be vital. If the Aztecs crush the Tlaxcalans in those few extra years, they would deprive any potential conquistadors of vital allies, and would potentially be much better able to resist an invasion (assuming, of course, that they don't trigger some other rebellion somewhere).
Also, those few extra years could be used by Hayna Capac to codify a method of succession to the Inca throne that takes into account if the heir apparent dies with the Inca. This means that, when European diseases do appear, if they kill the Inca emperor the empire will be less likely to fall into civil war and so will be better able to resist an invasion.
Finally, even if European conquest proceeds it could proceed in entirely different ways-for example, the Spanish may try to find a northwest passage to Asia before exploring the Caribbean, and so create Spanish-speaking colonies in what's now the Maritimes (not sure why they'd want to, though. Cod and fur, perhaps?)
Anyway, these are some variations on ideas that are pretty commonly repeated on the board, but rarely fleshed out. It's food for thought.