Slop.

I had to spend time taking in this delicious slop. After some reflection:

1. The drab grey interior isn't a killer by any means if he open the window blinds to show the greenery outside. I knew someone who had a room that was completely white. The white room was also right next to the backyard and the white room had massive windows that they constantly keep the blinds open. Having plants in the background takes away a lot of the sterile feeling that having a drab grey interior would produce.

2. The combination of everything being clean and brand new gives a completely sterile "this looks like a museum exhibit" vibe. There's absolutely no evidence that the dude or any human actually lives here. You could get away with this if you have worn furniture. For example, if the table and chair in the action figure room were worn out, then it wouldn't have that sterile feeling anymore because the table and chair would've been worn out from use. I think people like OP conflate something being clean and something being new. You could absolutely have a clean worn out table (that's how most people's tables look like).

3. No tools just gives me the impression that he's a talentless consoomer who literally buys everything, including the labor to assemble his treats. This particular aesthetic just speaks to a deep-rooted contempt of labor. Where's the screwdriver for his assembled gaming PC? Where's the paint for his assembled action figures? He like the vast majority of homeowners obviously has tools, but it's a clear aesthetic choice to hide those tools as if they're something to be ashamed of. This also fits neatly into your critique about him not showing his kitchen. He probably has perfectly functional knives and other cooking utensils, but because they aren't brand new (see point 2) and shows that he has to occasionally gets his hands dirty like a filthy prole, they must be squirreled away.

4. The four (4) PCs just takes the cake. First of all, he splurged money on four (4) complete gaming PCs instead of reusing parts like a normal person. Second of all, he lacks the technical skills to repurpose those PCs into something cool like some home server(s). Third of all, those PCs don't even look different from one another to show off. At least throw in a beige box (which would go well with the rest of the house lol) or something. And not that fake beige box which is obviously a PC case made in ~2020 but a real beige box where you need to unscrew 10 screws before taking the case out. It's funny that I could actually pull this off a lot better than him because I have a PC from circa 1995, a PC from circa 2005, and a PC from 2013. The only main obstacle is the 2005 PC is in an anachronistic beige box even though PCs from that era have moved past the beige box aesthetic. It also would work a lot better than four (4) gaming PCs because my memories associated with those PCs are very different from one another because they are spaced ten years apart from each other. Meanwhile, he's just using those PCs to consoom AAA slop.

I'm also scrolling through other posts on that subreddit and check this one out: https://old.reddit.com/r/malelivingspace/comments/1r5y07e/inspired_by_recent_star_wars_post/ This is literally just a cooler version of OP. Unlike OP's soulless consumerism, you could also see this person's personality come out of the aesthetic. The helmet collection is kinda creepy, but he's 100% aware of and leans hard to it right down to putting the lifesize figure of frozen Han Solo in the same room as the helmets. He needs a predator mask helmet or better yet a predator statue to really sell home the point. It's still consumerism, but it at least has some soul to it.