Emiru did a short stream going into additional details about the incident, as well as some other fuck-ups by Twitch staff that weren't mentioned in this article.

https://www.youtube.com/watch?v=_USuIpVAqAw

tl;dw: Emiru calls out Twitch for lying about the situation in their official statements, expresses concern for what sort of response a smaller streamer would've gotten if they were attacked like this, and draws attention to Twitch's lack of security and professionalism. Twitch staffers originally laughed about the situation to Emiru's face, and didn't seem to care until the video went viral. They ran background checks on everybody who signed up for her meet-and-greet event, but the attendees were allowed to bring a plus-one with them, who did NOT have to get background checked. Twitch staff also allowed people to walk around even after their badges couldn't scan properly.

Also, because this isn't anywhere near the first time Emiru has been attacked in public, she points out that she's spent tens of thousands of dollars for her own private security, and wasn't even allowed to bring her preferred bodyguard with her because he's permanently banned from Twitch events due to restraining a stalker during a previous event.

Twitch fucked up big time here.