Edit (now that the above post has been edited): I agree that the lack of an unequivocal follow-up to the SuperMicro story -- that is saying neither "we admit we screwed up" or "we stand by the main points of our original story" or even "we need more time to look into this pls" -- is quite troubling.
Still, you have to look at their broader track record, compare them to other outlets in their weight class (nearly all of which, like the NYT in particular, have indulged in many more, and far greater follies). That and the fact that what they're reporting in this particular case is consistent with what we know to expect from Tesla/Musk after various other incidents.
I would say their credibility stands at "significantly compromised", which is damning enough.
With the caveat that I find Bunnie Huang credible. https://en.wikipedia.org/wiki/Andrew_Huang_(hacker)
Specifically - does it make Bloomberg's telling of event more or less credible?