Greenwald's tweet in itself is disinformation. The Rolling Stone article quoted Dr McElyea as telling KFOR that multiple hospitals in rural Oklahoma were being overwhelmed with cases of Ivermectin poisoning.

One of the hospitals, at which McElyea has not recently worked, denied that it had treated any Ivermectin patients or turned any away. That doesn't mean there aren't other hospitals in the area that have been handling or even overwhelmed by those cases. It casts some doubt on the story, it's not a slam dunk debunking.

Rolling Stone was wrong to print the story uncritically without conducting its own independent verification of what KFOR reported. There's a damaging trend where news outlets will report on what other news outlets have reported without adding additional verification, sometimes giving flimsy stories more apparent weight.

But Greenwald is trying to pretend that the single hospital's denial is enough to render the entire story, and indeed the entire claim of Ivermectin overdosing, as false. That's dishonest too.