Will you keep your copy anyway or will you return it since you’ve been offered this option?
Another quality issue is that despite being a possible mp3 sourced recording, of course it’s practically unprovable, it might’ve been just low-passed, the sound could’ve been also post-processed, like auto declicked, denoised which potentially even further decrease audio quality if not used wisely. We can’t tell from the YouTube video, it sounds pretty bad there, but it is just 480p, so the audio track bitrate must be quite low too. Those high bitrate mp3 files that used to be offered on his website could give us some idea about the sound.
If the original audio tracks are not available anymore, he could’ve tried to re-record these tracks, that wouldn’t be the same as the original but certainly a nice approach in my opinion, and of course being clearly stated to be a reissue.
Daft is right that it’s against the Discogs policies to sell something under a different entry, e.g. you cannot sell a cassette under a CD or vinyl release page with a note like “WARNING: This is a tape, NOT a CD/LP”. Actually such listings may be reported, but I understand not everyone is keen on submitting a release they just want to sell and I’m personally fine with that if sellers are honest and clear about that in the notes, some sellers even warn you after you place an order, so they can cancel it if you overlook their notes and don’t want it.
There is a reasonable argument for heavy weight vinyl, 180 g or even 240 g, that is they are less prone to warping, but if they do, they are nearly impossible to straighten, though I personally don’t put much faith in these techniques. It certainly doesn’t sound any better, though some audiophiles belive it.