Can't rollback an app that won't start

My issue is related to this post:

There’s two solutions:

  1. update Postgres to 17 instead of 13
    or 2) Rollback the app update.

I’m trying to rollback the app update, and I get this error:

Since the rollback isn’t working, I may just do the Postgres update…

but for future reference… if an app update breaks the app entirely to where it can’t start… How in the hell am I supposed to roll it back, if it can’t be rolled back while turned stopped?