Per the video the chat exchange became about Micay claiming Rossmann was complicit in swatting just by leaving a comment on a video that was critiquing Micay's written communication, due to an alleged fan of that channel swatting them.
I looked up the tweet that Micay cited in that chat as being an example of harassment and it was an exchange with an F-Droid dev, where the full context linked was about Micay being so frustrated with how F-Droid's displays app permissions that he threatened to display a warning for all GrapheneOS users when the F-Droid app was launched explaining Micay's point-of-view about this, unless F-Droid changed it. It was that which prompted the dev to blow their lid.
Another F-Droid contributor then deleted both that dev and various of Micay's follow-up posts for the ticket for both being off-topic and against their conduct policies, so hard to judge anything further. Micay from that first tweet also cited another tweet that F-Droid devs were organizing raids on their issue tracker but the screenshot didn't show evidence of such coordination. If there was I can't tell from that tweet at least.
Like, the impression I get from all this as a third-party observer is of someone with strong opinions about how things should be done and funneled that energy into GrapheneOS, which by all accounts is a robust OS, security-wise, which is great. From HN anecdotes and other impressions I've read about exchanges though they predate the swatting attempt (judging by the date in this thread's article) and various pushback is said to get framed only as harassment (including a HN user who was labeled a troll).
More context is useful though and I'm not adverse to links/screenshots that provide more clarity.
Edit: I just noticed someone flagged my initial comment in the time between replies.
He made it sound like Daniel was going crazy on him for no apparent reason over a single comment he posted on the Techlore video when for one, we were wary of him already due to past disagreements and, more importantly, that very video is responsible for the swatting attacks that were aimed at getting Daniel killed by law enforcement. The swatting attacks were carried out by someone who loved the Techlore video a little too much. Do you see where I'm going? Rossmann had voiced his support for the very video that is responsible for the attempted murder on Daniel's life, I reckon you will understand that Daniel was upset over this.
Not much time had passed since these attacks took place so Daniel messaged Rossmann to figure this out and explain to him what this was all about. In private mind you, whereas Rossmann decided this was peak content and live streamed it while the chat was still taking place. Any human being with a basic sense of empathy and decency would have not done this since it was obvious that Daniel was in a bad headspace.
Yet he did so anyway. I guess that's not all too surprising given it was an excellent catch for his following on Kiwi Farms which he caters to.