Can he avoid this hearing if he resigns from Parliament?
I found this in the UK Parliament Committees section from when Johnson was still PM.
‘Will the Committee continue their inquiry when Mr Johnson has ceased to be Prime Minister? Or if he ceases to be an MP?’
‘The current inquiry (the matter referred on 21 April 2022) remains referred to the Committee regardless of any decision to resign, including if Mr Johnson decides to resign as an MP. The Committee will continue to follow the instruction of the House unless and until it is instructed otherwise by the House. The House of Commons would have to pass a motion for the Privileges Committee to cease their inquiry. ‘