In the aftermath of their glorious victory, Germany decided the fate of the Jews who had caused them such pain throughout the centuries. In a magnanimous gesture to allow the Jews a chance to redeem themselves for their millennia of sins, they were transported to fertile and warm lands far to the edges of the Reich where they could be safely monitored as they created their own society far away from where they might harm any Aryan. Tragically however the innate depravity, laziness, and duplicity of the Jews caused them to refuse to do any work or farming, leading to mass starvation (despite generous German food aid) and resulted in them slaughtering eachother en-masse in a final orgy of spite and greed, leaving no survivors. A sad yet powerful testament to the danger of the Jewish race even to itself, and the ultimate fate of a parasite whose host has rejected it.
And naturally, proof would be plentiful. There would be thousands of photos of ruined towns and villages, starved corpses in mass graves, and bodies of unarmed men women and children who were shot by their fellow Jews. In any case, the ultimate fate of the Jews would be of little import to citizens of the Third Reich. Those who cared enough to ask would be given this incontrovertible proof, and those who persisted or made seditious claims that these photos look suspiciously similar to sights seen in Poland, Belarus, Ukraine, Russia, the Baltics etc in the wake of German conquest would be treated with the full contempt Jew sympathisers deserve from society and the state.
Remember, the Nazis spun penniless Jewish refugees in the Warsaw Ghetto living in squalor as "undeniable proof the Jews are filthy misers who refuse to spend money on better living conditions" and visibly starving Jewish children begging for food on the street as "undeniable proof that the Jews' greed and obsession with commerce is genetic and even their children are subhuman scum" in The Eternal Jew. Farcically evil and blatant lies like above would be well within their zone of comfort. Also their propaganda would not be an effort to convince a doubting outside world but a thoroughly indoctrinated Germany under the assumption that enemy powers will inevitably collapse soon and leave Germany utterly unchallenged. The SS would delete all records and physical evidence of the Holocaust, with the only evidence being the few escaped camp inmates who made it to safety, private diaries (and possibly photos) from German/European workers/soldiers involved in the holocaust, allied intelligence, documents and such circulated within the governments of Nazi Allies, and possibly internal communications between Nazi leaders.
The world would be entirely aware of what the Nazis did, though many would likely consider the "deportations to their own colony" propaganda to be partially true (with it being understood as "we force marched them to a freezing wasteland and let them die of starvation and exposure like Turkey did with the Armenians") but once the Reich inevitably collapses, the accounts of those who partook in the holocaust would gradually filter out, and when combined with other info would lead to the einsatzgruppen and death camps slowly gaining recognition as the true mechanism of genocide.