The article keeps making a reference to those polled, suggesting they were also members of Congress - but it doesn’t outright state it. Did I miss something?
That might have been a weird thing to say, but Hank Johnson doesn’t have a reputation for saying weird things like that routinely.
And to the extent that people know what was going on with him, they probably don’t hold it against him. He was on medication for a serious illness and that medication is known to have some odd side effects.