From your own story:
Republican Congressman Ken Buck said that House members "were warned" that allegations leveled by an ex-FBI informant regarding President Joe Biden's business dealings may not be credible.
AND
In his statement to Newsweek last week, Comer said that the "FBI's actions in this matter are very concerning," adding that a source in the bureau had told lawmakers that Smirnov "was credible and trusted, had worked with the FBI for over a decade, and had been paid six figures."
So who is reliable here? Not the FBI it seems.