While Nousagi is trying to prepare his transformations into opposite gender in that stream, Nousagi did detailed somewhat about Nijisanji ID's video he made on
the 12:55 timestamp.
Short summary that I can get is that a NijiID fan reached up to him in private via DM/ private discord calls and pretty much blasted him with all the inaccuracies he put on his video minute by minute along with other things that Nousagi didn't do like mentioning stuff that wasn't done due to the merge (songs being cancelled, projects that was in productions pretty much cancelled, etc) and that there are talents who has voiced their issues and complains both pre-merge and post-merge (which are mostly in members and might not be archived with the talents graduated already).
Nousagi also claimed that he did watched ID talents beyond the clips, but the ID fan was like "and yet you wasn't able to clearly get the audience to realize that you also watched them beyond clips, which is fucked" or something like that. While at it, Nousagi also said that he do want to add more bits into the video, but he believed that longer video = less retentions, and less retentions = algorithm changed and lessening his chance to get his video reached by others (in his word, "Algorithm doesn't want details")
Nousagi realized his problems and was like "well at least the video did gave everyone the broad strokes of what happened", and probably wouldn't bother changing/revising the video and keep it as is in order for him to focus on other things like preparing for his vtuber model thing.
Lastly, as a show of good faith, he gave that ID fan who put all that effort a reward of $20.