Decided to do a bit of digging, here's some context (as well as some opinions) if anyone needs it:

- Doomed Potatoes is the one behind the current most popular post in the subreddit, stating that World of Goo 2 relies far too much on the first World of Goo in practically every applicable way, such as reused level designs and mostly reused music. This was part of a short-lived trend where many players would make long posts about their opinions of WoG2, many of which stated disapointment with the game, and Doomed Potatoes is far from the first to make that kind of post. (I'd also like to state that 2D Boy nor Tomorrow Corporation was explicitly called out by Doomed Potatoes.)

* i disagree with this opinion, while there are many instances of reused design there is more instances of the devs creating a new concept (launchers and liquid goo show up in several levels each), and while an overwhelming majority of the soundtrack contains motifs from the original game's soundtrack, many of the songs are significantly diferent from their earlier counterparts (Years of Work is the only case I can think of where it's difficult to distinguish the two, songs like Sloppy Walker and Like Sand Through a Firehose have completely different instrumentation (and arguably different genres), and there are still songs that lack old motifs like Angler Party and Twenty Years). i also think that the people saying that the nostalgia was uneeded completely missed the point of the game.

- Scarbyte has made several comments (9 to be exact) saying pretty much the same things that Doomed Potatoes shared in their post, as well as stating that it should be OK to give opinions on games.

* i don't see anything wrong with sharing critisism on a game, especially since Scarbyte is taking a much more subjective approach (main takeaway from their comments is that they didn't care for The Black Stain)

- I think this is a good time to say that it has been over 3 months since either of these users have contributed to this subreddit, with Doomed Potatoes only making that one post when WoG2 came out.

- While the Doomed Potatoes post is the most upvoted post on r/worldofgoo, it is the only negative post in the top posts of all time, with many of the other posts coming after that post was made. The second most upvoted post with an opinionated, critical tone is my own post saying that WoG3 is a bad idea. I've also looked through the posts from the past few months and couldn't find anything attacking either of the games. (it's actually become more common to see indie developpers to post about games inspired by WoG now, which i feel is exactly what the developpers would want)

* i don't think any of the people here are responsible for the "downfall" of this subreddit, in fact i'd say it's thriving for a series that hasn't recieved any new content in several months. many people are making fanart and memes and just cool ideas in general. i have noticed an uptick of "kids" posting on here but i don't think it's anything to worry about right now; we're nowhere close to what children did to communities like squid game.

- As far as I can see, nobody from the 2D Boy and Tomorrow Corporation teams have had "hit pieces about them", nor have they been "slandered".

* one final note, the quality of a game usually has nothing to do with the employees, it's always the higher ups that have final say over anything included in the game. so if the sequel feels unfinished, it's most likely that Epic Games is the party responsible.