Given that their goal was never to elucidate what actually happened that day, but to damage Trump's reputation and defeat him, it's no wonder that the Jan. 6 Select Committee encrypted and deleted so many files. Should these documents ever be recovered, they will show that then-Speaker Nancy Pelosi (D-Calif.) and her allies are those responsible for the escalation of the riot, as she rejected an offer Trump made to enhance security.
The House GOP is merely reviving an already debunked story to try to discredit the probe into the Jan. 6 riot. Former Chair Bennie Thompson explained in July that the alleged missing material was, in fact, withheld from the archives to protect witnesses as the committee was disbanded before a full review of its sensitivity. As for Trump's claims, there's no indication that any material concerns his professed offer to former Speaker Pelosi.