We have the testimony of three people that Trump offered National Guard troops--Trump's offer of National Guard troops has been corroborated, not debunked. You are citing the sham committee that Nancy Pelosi wanted, made up of members that would not require her to testify. We now have a video, for all to see, of her accepting responsibility.
And Politifact says that video is not about her taking responsibility for the National Guard.
Newly released video footage from Jan. 6, 2021, has reignited conservatives’ long-standing claims that then-House Speaker Nancy Pelosi bears the blame for the National Guard’s delayed response to the U.S. Capitol attack.
On June 10, Republicans on the House Administration’s Subcommittee on Oversight shared on X a
short video of Pelosi leaving the Capitol by car as rioters overtook the building Jan. 6. In the clip, Pelosi presses her chief of staff Terri McCullough about why the National Guard hadn’t arrived yet.......
As House speaker, Pelosi shared responsibility for Capitol security. The House and Senate sergeants-at-arms, who report to the House speaker and Senate majority leader, respectively, serve as the Capitol’s chief law enforcement officers. The two sergeants-at-arms, along with the Senate doorkeeper and the Capitol architect, comprise the
board that oversees the Capitol Police.
The U.S. president, defense secretary and U.S. Army secretary are the only people
authorized to activate the District of Columbia National Guard. The House select committee on Jan. 6, after its 18-month-long investigation,
concluded that official records and witness testimony showed Trump didn’t make that order Jan. 6, 2021.
In the video, Pelosi said, "I take responsibility for not having them just prepare for more," when talking about U.S. Capitol security. As then-House speaker, Pelosi did not have the authority to deploy the National Guard. The president, defense secretary and U.S. Army secretary are the only people authorized to deploy the District of Columbia National Guard.
Pelosi can't be responsible for calling out the National Guard when she had no authority to do so. Nor was the offer made for the National Guard to be there. Trump could have only called out 2000 and needed local governors to bring in more to get to 10,000 if that was the case. The local governors do not support Trump's claim.