It says:

@_cryptagion@lemmy.dbzer0.com holocaust revisionism is genocide denial AND antisemitism.

In case you are actually interested in a serious response here are the symbols used in holocaust camps. The first of these, the red triangle, designates “political” prisoners, which was applied overwhelming to communists and social democrats (meant the same thing at the time anyway).

Here is another shorter chart in English:

You are poorly educated on this topic and should sincerely read some actual books instead of getting everything you know from internet comment sections then screaming at the people who are correct because the information you’re being corrected on doesn’t fit into your deeply deeply propagandised worldview.

Oh and calling everyone that says anything you dislike a russian bot is indistinguishable behaviour from the IDF calling everyone they dislike Hamas. Deeply unserious behaviour.