I've seen a lot of people compare Pluto to LiberalSocialist. I don't not believe that they are the same.
LiberalSocialist was fixated on posting and debating extremely online twitter discourse which received a lot of engagement because many other people seem to also enjoy doing that. LiberalSocialist was often reposting things from the D*stiny subreddit and exhibiting traits of a D*stiny fan.
To my knowledge, Pluto was not fixated on online discourse. Pluto seemed to mainly post about real life stuff, not online stuff. Pluto posted about orgs, particularly CPUSA as mentioned in the title. The reason that people seem to dislike Pluto is that Pluto asked people to exercise critical support towards the CPUSA.
Hexbear is aligned with the The Deprogram podcast. I know that multiple Hexbear mods also moderate The Deprogram reddit. Second Thought aka JT, one of the hosts of The Deprogram, is a member and promoter of CPUSA. Second Though has posted on hexbear and done an AMA, (maybe two?). Second Thought has even talked about Hexbear on the The Deprogram podcast.
This seems like a huge contradiction to me. You have one user who is hated for being a promoter of CPUSA and another guy who is beloved by Hexbear despite being a promoter of CPUSA.

This is an absurd amount of projection, coming from the perspective of hexbear. Hexbear is a social club. You are a member of a social club. Look at the post history of the OP of this thread, it has no substance or any reference to leftism, just engagement baiting and shibboleths. When I look at the post history of Pluto, there is at least some substance and Pluto to me at least exhibited some understanding of socialist theory.
The entire front page of hexbear is constantly littered with gibberish inside baseball by like 10 people. For a brief period of time when Hexbear federated with lemmy, hexbear accidentally had a somewhat decent algorithm so that the front page wasn't littered with garbage posts all the time and what happened? The devs brought back the old algorithm which promotes spamming nonsense. This same algorithm is what allowed users like LiberalSocialist to gain so much engagement.
Here's JT's video promoting CPUSA. https://www.youtube.com/watch?v=JrnLyvZrdEw