I dunno much about this stuff....but that's never stopped me before.
So, I would speculate that Don Trump's very public comment puts a little more ooomph into the Select Committee's resolve. Both their personal resolve for their reputations, and their professional resolve to make sure the whole story of January 6th.....pre-, during, and post- gets a full airing.
IF....he is in a postion to pardon, and does it....well, the Committee will want as complete a historical record as possible. Their complete efforts for posterity.
So, while the MAGAHats at the rally liked it, it may have just ratcheted up the will of the Committee. Not that there wasn't enough already.