the thing with Bandcamp, if an artist doesn’t enter an album artist for a release (i.e. they leave it blank), it defaults to the main page’s artist name. so if they change that name, it’ll also change all their old releases, whether intentionally or not.
I likely wouldn’t create a new release if I suspected this was happening, but if they’re already there, they certainly should be in the same release group. if you know when it was changed, I might set that as the changed album’s release date, otherwise leave it blank
in cases where it seems more intentional, like if they change the album art to use the new name, then you should likely use the withdrawn release status. this doesn’t look like one of those cases though… 
one additional thing, you can connect both artists through a legal name artist, that way both projects are shown on both pages. as an example:
note, depending on which direction you’re relating, the relationship could be called Legal Name or Performs As
it would seem this artist’s name is on their Discogs page already, so that makes that easy~