Well, you have to remember that they were also using the term 6 million, along with 5 million, 3 million, 2 million and other stupid high numbers and claimed they were being oppressed genocided by other nations before then too. So I would not doubt that some fuck would use the term "holocaust" even before the end of WW2 and jews started up their scam in full force. Atrocity propaganda, after all, does not wait for the enemy to already be defeated.