This process did work well. I now have a full pedal on first touch. It appears to be related to the booster/master cylinder interface. Just to note my truck is brand new, 758 mi now.
I have new 2022 GMC 2500 HD AT4 6.6 Gas and one pump will bring the pedal to where it should be. I have only 753 mi and been this way since I picked it up last week. The dealer offered no solution.