The GOP is deeply concerned about Trump's mental state, and panicky about it getting into the public narrative. We know this because of how hard they're peddling the opposite AND projecting it onto Biden.
When Trump was on Capitol Hill recently, the GOP didn't speak one nanosecond about content of the meetings. Their talking points were - Trump is happy, Trump is laughing, Trump is confident, and Trump is in good spirits.
It means Trump is miserable, somber, desperate, and in terrible spirits.
Everything they say and do is a confession or projection.
EVERYTHING.