The thread you've linked is deliberately misleading, refuting a strawman version of the "conspiracy theory". Everyone has always agreed that the server was intermittently available until Feb 2020. It's a particular database that went unavailable in Sep 2019, not the whole server. Quoting from a document written by the "conspiracy theorists" more than a year before that thread:
> Batvirus.whiov.ac.cn had been online for a few years, saw a version 2 released in June 2019, went inactive for a week during the second half of August 19, before becoming definitely inaccessible (out of the WIV at least) on the 12th Sep 19. It was online intermittently after this date from mid-December 2019, and occasionally until February 2020, but was not accessed from outside of the WIV after 12 September 2019.
https://www.researchgate.net/publication/349073738_An_invest...
Were you aware of that? If not, then you might update your priors yourself.
The disappearance of that database obviously isn't proof that the WIV did anything nefarious. It continues their pattern of zero transparency, though. That might just be the reflexive secrecy of an authoritarian state; but the nature of zero transparency is that we don't know.