Back in 2010/2011, Thomas Ridgewell (aka TomSka - the guy who made asdfmovie) made a presumably self-published comic titled Zack. Very little is known about it other than it being available at a few specific London-based conventions in the 2010-2011 range and the appearance of the cover. We can assume it was not illustrated by him given the difference in art style from the cover to his usual art.
It's mentioned [HERE] during a self-made iceberg/deep dive video, alongside a full-res scan of the cover.
I've also found images of his convention table (in extremely low quality) taken at MCM London in either May or October 2011, giving an extremely narrow range of availability, likely with very few copies printed.
He also expresses regret over the comic, but doesn't elaborate; I can only assume it was over the writing or a dispute with the artist in the vein of other disputes he had at the time. When asked about the comic in a [2020 Reddit post], he doesn't seem to want to rerelease it, but again does not elaborate.
For being such a long-standing content creator (creating videos on YouTube since 2007, being involved with series like Eddsworld, creating the viral series asdfmovie), much of his creative work is archived with a few exceptions, one being on the LMW itself. I can't fathom a rerelease (whether physical or digital) nor do I have a baseline as to how many copies are out there that could potentially be archived.
The 2020 reddit link just links to this post, but I think I just found the same post you were talking about.
I am very curious why he won't re-release it, but I bet the reasons you stated have something to do with it. If he worked with an artist, then I wonder if we can find them and see if they have anymore images? Otherwise, he did have a pretty bad track record with artists back in the day, but weird he wouldn't have admitted to anything of that nature in that long apology tumblr post.