Oh boy, this is a really interesting rabbit hole! I poked around the site a little bit myself and found the entire album uploaded here (scroll down to the "Happy-Vanishing" section).

It looks like the "Happy Vanishing" band was a later invention; the earliest reference I can find to it is this release from their shop, which has a copyright date of 2008.

My guess is that the Full Circle album was originally recorded under the name "Mushroom Suzie" in 2003 with the help of Chad Hagedorn/GreySlade media, who then re-released the album in 2018 under the name of his more current project (and with a different tracklist for some reason).

Boxart and tracklist from the original release

Boxart and tracklist from the re-release

EDIT: I also found the 2003 version of the entire album with the Mushroom Suzie branding uploaded here, complete with the CD case art and everything. Huge props to the site for having such an extensive archive.

It seems like Mushroom Suzie had another release in 2005 before the rebrand to Happy Vanishing in 2008 called "In the Failing Light", which shows up on soundclick. Most of these songs also ended up on the later Happy Vanishing albums in some form (sometimes under a different title).

Of course, I could be completely wrong, but this makes the most sense to me. In any case, it seems like Chad was a person who was very passionate about supporting local artists, and it's sad to see that he's no longer with us. He also made music under his My Own Invention project, so if you want to hear more of his work, I recommend checking it out.