Hexbear oppose Putin while frequently talking about theory and communist philosophy. There's barely a single popular post that doesn't at least reference leftist theory. You clearly are just talking 100% rubbish.
My bet is on you having been banned there for being some form of ass. Just because that seems to always be the case.
Like it or not, the reality is that regions in the East of Ukraine were very much on record as supporting Yakunovych, and closer relations with Russia, for decades. There's only one reason the Minsk agreements fell through, and it's because they did not want to give eastern regions autonomous votes.
If the other half of your country coup'd your president, half-outlawed your language and ignored the political will of your half of the country, you might have a right to be upset and label that suppression.
This is not what "so many of them support" and I know you cannot source a popular post to prove otherwise because it doesn't exist.
Hexbear oppose Putin, they just also recognise Ukraine and NATO also behave very shittily, sometimes moreso. There's a recognition that the west have gleefully egged on this war at the expense of innocent Ukrainian/DPR/LPR/Russian civilian lives.
When someone is banned, their posts are automatically deleted, it's not some crazy admin obsession to 'purge your entire history'.
This story does appear to be "an admin abused their power to ban me, then that admin got banned for being caught abusing their power". Which is not uncommon in online communities.
Hexbear has plenty anarchists. Left unity is a strictly enforced rule and has like 20 dedicated emotes.