“I was threatened into staying silent by Jan 6 committee“ - Trump Defense Secretary

https://youtu.be/psgE3MnH9cI "Stop saying Trump authorized National Guard" - Jan 6 Committee threatened Trump's Defense Secretary.
Trump's Defense Secretary Chris Miller alleges the January 6 Committee threatened to 'make his life hell' if he didn't stop saying Trump authorized National Guard deployment before the Capitol riot.

Miller specifically implicates Liz Cheney in this intimidation effort, alleging committee members warned him of additional hours of questioning if he continued defending Trump's actions on TV.

Additionally, the committee allegedly withheld a transcript from a senior White House official who corroborated Miller's claim that Trump sought to deploy 10,000 troops to the Capitol before January 6.

General Milley also reportedly informed the Department of Defense Inspector General that Trump had requested a National Guard presence at the Capitol, an offer that the DC Mayor turned down.

Why did the January 6 Committee choose to conceal so much evidence that exonerates Trump?