The actual policy is not to fact check political ads, but they will still take down "ads that encouraged violence or seek to suppress voting." (after quick googling I found this, there are probably better sources: https://apnews.com/64fe06acd28145f5913d6f815bec36a2 )

I don't know like you, but Hitler's 'final solution' seems to be fitting the violence bucked, so should be taken down. So at least the title is not right.