Your analogy fails on the fact that rarely does the author have 0 imputed. If I tell a worker to do something and it ends up done poorly, it still falls back onto me as their supervisor.
It is still their IP, and they got the rights back, likely had a hand in putting it on sale and then went sorry about your broken game. TT is definitely the main one to blame here but TFP are not absolved of any responsibility especially as they now own the rights.
Even if we pretend things are exactly the way you say in such a simple scope on the subject, The game is on sale right now on xbox. Friends of mine bought it in the past week. They literally just bought a severely broken game that is CURRENTLY owned exclusively by TFP.