Easily. It's not a fact.
It's an allegation made by the Senate Republicans for which they produced no evidence, apart from a secret document they won't show anyone. The 2 minority members of the committee both said there was zero evidence tying Biden to $3.5m payment on that document.
The Republicans also sent out zero subpoena's to the company the money was sent to, or any of the employees of that company to make the allegation a fact, backed up by financial records and testimony because they know it's not true.
They didn't send out any subpoenas because they would have confirmed the actual fact, that Hunter Biden is not connected to Rosemont Seneca Thornton, the consulting company who allegedly received the money.
That's why the attacks don't stick.