The reason the scheduled the surprise hearing was because of her "bombshell" new revelations.
When those turn out to be obviously false, and the person she claims told her about it denies ever saying such a thing, that says something about her credibility and, more importantly, the credibility of those who believed and promoted her claims
Her description is certainly not "obviously false." Ornato says (though not under oath) that Trump didn't grab the wheel. But that's not what she said. She said that Ornato told her that Trump "
reached up towards the front of the vehicle to grab at the steering wheel." Not that he necessarily actually grabbed it. But I'm sure Ornato will return to the committee to clarify this.
More important: Why do you focus on the description of Trump's behavior when angry? This was a minor part of the 2 hour testimony. More relevant:
Trump has been claiming that the rally was peaceful but CH’s testimony shows that he was repeatedly made aware of the potential for violence. He knew about the arms carried by those who arrived at the rally. When he saw that the Ellipse was emptier than he liked, he told the secret service to remove the metal detectors so that more of those armed people could enter the Ellipse and march together to the Capitol. There were multiple signs that there was the potential for this to end in violence.
More details were given of Trump’s refusal to take any steps to stop the riot for several hours.
Mark Meadows and Rudy Giuliani had requested a presidential pardon for activities related to the Jan 6 attack on the Capitol. So they, at least, believe they did something wrong.
Anonymized letters were shown that suggest some Trump-supporter is tampering with witnesses.