This has nothing to do with 5th fes, Petra, or any of that.
It's actually 3 different reasons. The first issue that they're complaining about is this:
They're really pissed because it looks incredibly unprofessional and it makes them think that Niji isn't in control of anything because in their minds, everything was perfectly under control at the JP side of the company.
The second big issue is that they finally found out that the NijiEN issue has been picked up by the big overseas youtube channels with 10+ million subs (Asmon, Critikal, Mutahar, etc). They're starting to believe that the damage is permanent and NijiEN will never recover to its prior success because these big channels have spread all the bad news and ensured the brand is poison in the EN market.
The third issue is that they have started to analyze NijiEN's viewing time and realize the Doki situation wasn't just a big controversey that hurt PR, it had a tangible impact that nuked that branch. They've talking about the February and March numbers and they're not happy with the situation. They're like 3-4 weeks behind on the entire details of the EN branch because they never dug too deep into analyzing it. So they're finally starting to figure out that the Q4 performance for NijiEN is going to be worse than the Q3 performance.
The main point is that they thought NijiEN could be restored to its former glory and they're just now getting the memo that the branch is public enemy #1 right now to the EN market. They're realizing that Riku's promise to restore the NijiEN branch to its former glory is worth jackshit and the company has managed to get into another controversy with the Suisei shit. There's also now talk that because the stock didn't rebound hard enough, they're all scared that the stock is going to tank even more.