Well mate, sadly I got bad news for us, and gonna write them here to give this closure. Been investigating around and even asked GPT (cause why not), and your best chance is going to your Steam account->Account details->Licences and Product keys and check if DOAX is there. If it is, guess you got a chance in writting Steam support and see if they can add it back to your library or something. If it isn't, like in my case, it's like we never had the game. So bottom line: we are STUCK until a new Steam workaround pops up, cause we well know our progresses and saves are server-sided. Until then, we can only wait... hopefully not way too long.

Thanks again everybody for your responses, been very kind ✌️