Regarding the rest of your post, I've worked in audit-adjacent fields so am well aware of the limitations, but it also creates some of my scepticism. Buyers of reports have a lot of influence over them. I think if they really wanted to, they could have engaged a charity or similar, funded them to contract investigators and ensured the whole thing was performed at complete arms length. And been very clear that all employees (past and current) were interviewed with full anonymity.
That aside, if I'm being honest, any outcome that saw them found innocent was not going to assuage my concerns. I understand that in a sense that's unfair, because perhaps they are completely innocent in this case, and so I'm judging them unfairly. But I find it far too convenient that they keep having incidents, and they're never to blame.
Just off the top of my head, they were using some software without appropriate licensing, and Linus blamed being too big to notice. Linus slagged off DarkViperAU for a video that he confessed not even watching. Linus refused to provide a proper warranty on the backpacks (IIRC) until Steve called them out. They screwed up their review of and I believe then stole a custom waterblock, and Linus basically said they'd done nothing wrong until challenged. They've been accused of unreasonable working practices / excessively pressuring their staff on multiple occasions. Then this happened. And, the entire time, Linus is basically rolling around in cash, showing off how wealthy he is and how big and successful LMG is, but then as soon as something goes wrong acts like they're a small start-up and can't reasonable be expected to, for example, license their software. I don't buy it.
If this was the only thing that had ever gone awry, and a law firm said "yeah, we've investigated and you're squeaky clean", I'd be fine with that.
But they keep making blatant, public mistakes and then denying all accountability until it's about to smack them in the wallet - at which point they beat a quick retreat and say "hey, it's an accident / we've learned from it". So for me, they've lost all credibility and I don't trust anything that comes out.