From the small bits translated so far, the part about the perpetrator being a Niji Staff is misleading. The person whose been doing the creepy shit is a well known music producer by the identity of YAB. He's been an influential mixer/music producer whose worked with not only Nijisanji but other projects from different entertainment companies. The allegations levied from KoreKore are as follows.
Alleged man's account
Twitter link
Archive link
-Taking unsolicited photos and recordings of Nijisanji vtubers who came to his studio.
-Spiked the drinks of female livers to get them vulnerable in order to take sexual images/recordings to sell to third parties.
-Overall sex creep and degenerate pest that made posts in the private chat groups discussing his intent to sexually assault the female livers.
-Using the obtained images and recordings above as blackmail material.
All of these was leaked by an employee who worked in YAB's entertainment company.
I'll update this if more confirmation comes out and better translations come by. For the time being, take all of this with a grain a salt as KoreKore is a dramafag who tends to embellish his news coverage.
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Oh boy, this seems legit.
Edit: Red fucking alert. Nijisanji is taking down or privating all MVs with Studio Yab as the mixer. As I was trying to archive that YouTube page, it suddenly got taken down and I can't find the video anymore.
Btw, if you guys are lurking on vt/ on 4chan to try and find more info for whatever reason, the jannies have already memoryholed 2 boards discussing the situation. Go to warosu instead.