There are exactly 2 named sources in this article who say Biden is unfit. Johnson and McCarthy. One other pub senator from Idaho says something like Biden in real life is as you see on TV. All the other "sources" are unnamed. Who are the Dems? Sinema? Manchin? A "unnamed dem" means absolutely nothing and should be treated as such. But sure, lets see what the "unnamed dems" actually said according to the article-
"Some who have worked with him, however, including Democrats and some who have known him back to his time as vice president, described a president who appears slower now, someone who has both good moments and bad ones."
"Some who attended the meetings attributed off-key moments to his speech impediment and his tendency to be long-winded. Those who expressed concern about Biden said the behavior they saw suggested an unevenness, not the caricature of an addled leader that some of his political opponents draw. "
Has 80yr old Biden slowed down, is less sharp than in his prime, and had "bad moments"?? Sure... as have all of us over the age of 40. But for the two named sources to criticize his negotiating ability, when they both were clearly out negotiated by Sleepy Joe is par for the course for the alternative facts party.