The meme in question will be seen as a praise of Putin by those who admire Hitler and love to see his mad face in the media.
also it’s not illegal if the image is for educational or informational purposes so maybe he just could have claimed that. no reason to should “censorship” when it’s literally just a swastica or nazi greeting you can’t do in public.
but nevertheless - claiming to be victim of censorship is such a common trope nowadays, so maybe the author even reported himself to get some publicity. he is actually a pretty crappy - or let's say controversial - historian and is not really interesting enough for anyone to purposefully discredit him.
And it can stuff mentioned free speech hero JD Vance who want Europe become fascist again too.
… ironic result