I don't actually know what Alex Roe is doing, because I'm not familiar with whomever's music to which he is paying homage. I just assumed he is a fan of a certain type of music and/or specific band, and is creating original but similar-sounding music and similar-looking artwork. A musician can freely imitate the instrumentation and musical style of another band as long as they're not infringing on that band's copyrights or trademarks.
In that case, it sounds to me like he is definitely toeing the line. If he were mimicking a musical style, an artwork style, and a song titling style, he'd be fine. But if he's allegedly copying the same fonts and design layouts as the other band, and it's obvious that his chosen song names are more than coincidental, and his pairing of songs, titles, and artwork are more than coincidental, and his songs are almost carbon copies of the band's originals, then he could be walking on a very slippery slope.
The things he does that I'm interested in are all inspired by videogames not other bands. Here is an example.
The original game:
And here are two cover artworks from Alex for his music inspired by the game:
I think I'm just so frustrated, because he's writing the kind of music that I would wanna write myself, is better at it than I am, AND he is reaching degrees of success with it that I never would be able to reach (even if I was better at the music part, which I'll likely never be) because I wouldn't dare pushing my luck the same way he does. I simply couldn't sleep with opening myself up to the risk of getting sued like that (unless he has some inofficial but legally binding agreements that none of us have knowledge of, but I'd be surprised).
Another example where one band copied another band is this:
(Band = Rammstein; Album = Völkerball)
(Band = Völkerball; Album = Weichen + Zunder)
Apparently Rammstein wasn't OK with this, and now they're called "Heldmaschine" (found the same cover with their new name).
Afaik they started as a cover band but then they started making their own songs and they nailed the style well enough that there are comments under e.g. this video on youtube where people ask if this is actually Rammstein:
I kinda like both. As far as I'm concerned it's totally fair game to copy the style and feel of something else, and it would be to the detriment of everyone if this was even attempted to be prevented by laws. But I do think that trademark law has its place, the markets would likely be a nightmare of hard to distinguish knock-off products otherwise.