If we're splitting hairs, I'll concede to misleading being a better word than bullshit.I think the best you can argue is “unfair”— Totally accurate but not giving both sides (that more than half also thinks Trump is too old) does not amount to bullshit, not with the deluge of seriously misleading headlines in this clickbait era. “Prefer Trump” would be bullshit.
The Biden number is justifiable as a headline on its own IMO. Context is a must for the article, not every headline. It’s arguable.
The Biden number as a headline has no context without the rest of the poll results though, so I can't agree that it's justifiable as a headline unless we're saying that the goal is a loaded headline.
Context is a must for an honest headline. But we know how important that's not to people these days.