Maybe it's a regional thing, but I'd never run into the weeb--Metallica connection before. The rest of the list is accurate to my experience, so I don't doubt your scholarship.
Man, Lou doesn't even put in the effort to be a weeb. Everything he talks about is surface-level stuff. You'd expect that on politics and philosophy, but he can't even spout off the deep lore of Kamen Rider to an unwilling audience.
The only fandoms he seems to put any effort into are Wonder Woman, Dr Who, and MLP.
His Brony credentials are surface level
at best, he's lost MLP debates against twelve year olds, for Godssake.
Dr Who, I think can be summed up by Lou's Doctor scarf. For those of you who missed the room picture dump: Lou owns a Dr Who cosplay scarf - which, ok, fair enough, that's a dorky thing to own, point in his favour. But the scarf he owns is a dirtcheap, Amazon knockoff, completely inaccurate to the show. There are thousands of cosplay clothiers and autistic Dr Who scarf-weaving tutorials online; Lou ignored all of that, and went for the most low effort product available.
And Wonder Woman? I'll admit, I know nothing about Wonder Woman myself, and can't be assed enough to look it up. However, Lou never really seems to bring her up, except in the most generic and oblique ways possible. He's not posting about Wonder Woman storylines or writing blog essays on the philosophy of Diana. He just buys random blankets and bandaids with her logo on it, and once in awhile, once in a GREAT LONG WHILE, he'll commission a tittycat dressed in Wonder Woman gear.
"These days"? IME Dragonforce had been a favourite among spergs and tards for a long time, "OMG solos LITERALLY so fast no one else can play them!" and shit.
I have no idea about Metallica, but some weebs I know/used to know had slight dips into prog rock: King Crimson, Yes, ELP, bands like that. Had something to do with Jojo's Bizarre Adventure IIRC.
Is Dragonforce still a thing? I haven't kept up with metalspergery in some years now, but when I dropped out, the Dragonforce nerds had all switched over to Sabaton. There was also a lot of crossover between bronymetal and weebery, and Kawaii metal and weebery (for obvious reasons), at least in the years just prior to quarantine. Weebs getting into prog rock b/c of Jojo would make sense (the series is
full of references to grandpa music), but the people who like Jojo are usually girls, and girls don't like metal.
It's kind of scary to think that there are now more years between us and
Reload, than there were between
Reload and
Kill 'Em All. And yet, getting back to the point about the lack of effort Lou puts into things, our buddy Ace has made absolutely zero effort to keep up with the wide and wonderful world of dorkwad metal. I could picture his fat, weepy self enjoying all kinds of stuff, from Tuomas Halopienen's highbrow and sophisticated Scrooge McDuck album, to pleb-tier memeshit like Okilly Dokilly. But he doesn't. Lou's cultural tastes are the same as his culinary ones - Lou has his plain ketchup bottles, and he squirts them all over everything, decade after decade, a habit that will never change until he dies.