Correction: Bennie Thompson vice Bernie Thompson. I was unable to provide a workable link, hence the Google search.
The letter is to the Department of Homeland Security's General Counsel, Jonathan Meyers, from the chair of the Jan. 6th investigation committee, Bennie Thompson, in which he mentions, "We were very disappointed to learn that text messages on many Secret Service phones had been deleted in the weeks after January 6th."
This is not an idiotic claim. It is an official record. Unfortunately, you like to dismiss anything you disagree with.