I am happy to hear that you did join and have been on-boarded! Your first paragraph sums up how things have been in my own experience. The org being a broad spectrum of the anti-capitalist left (imo) makes it a good place to meet and respectfully interact with comrades and learn more stuff you might not otherwise have.
My chapter primarily uses Signal for our primary communications and working groups. Though we have used Discord for chapter meetings (we have also used other options to see how well they handle video and audio). The real annoyance with Signal is that it can't do sub-chats/rooms like Discord or Slack. You can only "pin" like four group chats to the top. So as more working groups are made it becomes a "which chats should be pinned" issue.
The old "hate the sin and not the sinner" bullshit. This shit is the Russian equivalent to "MAGA Communism". Such utter support of conservatism and "traditionalism" has no place in the revolution. This perversion that claims to be a "communist party" would be purged if comrade Lenin were alive today. They are just as much the enemy as capitalists, fascists, and monarchs. Right wing shit like this belongs with Nazbols. If I remember correctly, one of the top CPRF leaders literally wanted the Russian Federation flag to be changed back to the flag of the USSR. Just because they claimed "things were better with that flag" or something like that. Not because people had equality or any of the actual shit that made those better times. Just wanted to use the imagery of socialism/communism to paint over the bad shit and act like everything is good. I'll see if I can find that article and reply to this with the link.