Credibility isn't a thing that opinions have, is it? We each choose how to define "disaster" for ourselves.

But you seem to be ignoring the (alleged) facts supporting the opinion.

It's being reported that Trump never sent another "truth" after a short introductory one quite a while ago.

Either that's true or it isn't. If it's false, then how hard can it be to find proof?

The reporting gives them credibility, which of course could be rebutted by showing they falsified it.