This sounds so condescending but it’s not meant to be 
Don’t over think it. If you can do the 90 second interval sets, two minutes is well within reach.
I like VO2 but Dade+1 this morning really pushed me. My approach is to just plug-in and play. I don’t study the workout and let the numbers get into my head. Instead I jump on the trainer and say ‘this is about repeatability.’ Once my form drops, I’ll drop the intensity. 120% is a guide. Your VO2 might be 117 or 115%. Experiment and settle on ‘that’ figure.
I’m sure that Coach Chad emphasises repeatability in almost all the VO2 workouts. Try starting off at 115% and nudge things up if it’s too easy.