I googled it after reading your comment cause I realized I didn’t actually know what it meant.
There were a few definitions but I’m guessing this is the one the person you’re replying to meant:
“deliberately attempt to conceal unpleasant or incriminating facts about (someone or something).”
Idk why they thought someone calling out Nazis for spending resources on the Holocaust up until the very end meant that people are whitewashing Nazis though.
To add onto this, has anyone found a good way to combine the metadata back into the photos from Google takeout? I’ve found two solutions on Google, one was send it off to some company and pay them to do it and the other has me run some pre compiled exe file. 
I’m starting to think I’ll just have to live without the metadata or write my own solution.