I think he followed up with https://discourse.tt-rss.org/t/failed-updating-to-version-136/2096/24 saying it's unlikely.
Maintaining two version of ttrss is probably going to a bit too much work for us atm especially because the mysql version works just fine (I use it everyday myself).
I think in the long run, if they do decide to move away, we will do an OPML based transition (hopefully Cloudron can do this transparently as well).
We will update the app π We want to move fast but not way too fast, for example, rolling back the schema changes in the post you linked for example would be a lot of work with little gain if we had moved too fast.