First of all, let's throw all the hypothetical situations of new players downloading a high-res pack and immediately getting banned out. It's not like I have an auto-ban process or anything like that, and that's not the case here. Texture bans are dealt with on a per-case basis.
Aveiro has been around for a long time, been involved in discussions on this forum about textures, and probably a lot more discussions about textures outside of the forums. He's even been previously banned for unfair textures. Does anybody seriously believe he doesn't know you can get banned for unfair textures like these? Like, seriously, honest-to-goodness believe that?
Almost-solid-grey wall textures, washed-out-to-almost-white grass, super-light -- in some cases white -- barrel textures, faded wood textures that you almost can't even tell the wood grain direction on, etc. It's like a collection of every texture that pushes the limits of what should be acceptable, just from a common sense perspective.
Let's take a look at the first ban. Aveiro got screenshot'd a few times with some highly questionable textures. I believe this was before screenshotting was common knowledge. As a test, I asked him to send me a screenshot, and, poof, magically they were textures from a legit looking texture pack. After some back and forth in email, he basically said, "Just ban me. I don't care about this game."
Now Aveiro is back, and he obviously tried the official HR4 pack, but, without posting a single line of constructive criticism on how to improve it, switched to some other pack (or carefully selected collection of textures?), and proceeded to play with that. When JMR made a post along the lines of, "Dude, play fair", he said he wouldn't because the official textures were so horrible they gave him a headache.
Really? If his options are to play with unfair textures or not play at all, I just helped him with his decision.
To those saying, "If he knew, he wouldn't have posted the screenshots," I've seen people do a lot dumber stuff, like posting a screenshot of a scoreboard with a wallhack visible, or posting a video with solid neon-colored character models. If he genuinely was unaware using textures like this was not acceptable, why would he have tried to hide it from me way back when he was first banned?