[cxr]

You're not following/understanding what the linked Twitter threads are actually saying.

There is no mention of O'Nolan being rude (although he did make a number of untrue claims, which at least pretty negligent—but that's not a charge that the linked tweets say, either...)

There was no code use, and there was no copyright violation/failure of attribution, so there is no "yes we use some code, oops we will add attribution" called for, nor would it even be logical to do so.