As an engineer and someone who is a professional, the question is not about a conflict of interest, the question is about the APPEARANCE of being in conflict of interest.
You cannot work for a site doing reviews and being part of a subreddit part covering one manufacturer. On that, Steve is 100% right and that's the reason why he doesn't accept any kind of financial support from any companies for any events.
Like it or not, it just demonstrate a BIAS. Basically, you need to choose one or the other, so choose which one is more important for you.
I'd be careful about holding up Gamers Nexus as the authoritative voice on right and wrong in the tech industry. He's broken some good stories, but he does journalism by his own rules and not by any widely agreed convention.
He stated in the past that GN has a policy of NOT asking companies or individuals involved in a story for comment if he believes they may engage in PR spin to try and get ahead of the story, if he doesn't think he personally trusts any statement they might give, or if he doesn't believe that it's necessary to get their side. He could present their statements with comment, but he feels that some subjects don't deserve a chance to comment and he gets to pick who is worthy.
He took down a video in the past where he says he does not believe in responsible disclosure. He said that if he discovered a 0-day in an online service and it was
his belief that the service would attempt to fix it quietly and get out ahead of the expose and deflect, he'd drop the exploit into the public space without warning them so as to not undercut the impact of GN's story.
Gamers Nexus
DOES in fact take money from categories of products that they cover. Maybe not for events, but reviews and news are sponsored by cases and power supplies and CPU coolers all the time. I've been told in the past that the way they do this is that they review the product, then go to the manufacturer and say "Hey, we liked this, do you want to pay us to advertise it?" which they consider to be more appropriate than having an editorial firewall where the video writer and host are blind to what ads will be cut into the video. I disagree.
Regarding bias; Steve has expressed a belief in the past that if you previously worked for any company in the tech industry, you cannot work for any tech journalism that covers your past employer in any capacity at any point in the future, because that previous employment creates an appearance of a conflict of interest that is so sticky it attaches to the entirety of any future employer. That feels quite unreasonable as a base assumption without proof.
Edit: Also, the guy has (or had, at least) a thing for wanting everything to be incredibly overbuilt, even when the return on that for the customer is... dubious. I remember him saying he couldn't recommend a PSU that met or exceeded every ATX spec and checked out to it's 80+ rating because it didn't
exceed the specs by enough, and him going on and on about how Arc has better PCB design and more power phases and better cooler build quality relative to Radeon... only to have the equivalent Radeon stomp it in the actual performance testing (with then-current drivers).