That is not a criminal trial; the Congress is not a court of law.
Ha! Nevertheless, he was found not guilty. In accordance with the US Constitution, the Congress has the right to charge the president with “High Crimes and Misdemeanors” and judge him on evidence thereof.
Nancy Pelosi was convinced he committed insurrection and so charged him. The Senate said he did not do such.
I don’t care who you are and what kind of lawyer/scholar you think you are, but that is part of the record and needs to count in this phony charge being brought before the various states, especially since he was never charged with insurrection outside of the impeachment.