Nobody has time for anything they don't make time for, and making time for 2 hours of exercise related activities is far more difficult to muster (in terms of willpower) than making time for 10-20 minutes of the same.

I'm glad that you have unlimited reserves of willpower and have no trouble with procrastination and as a result can just do any task on demand no matter how seemingly unpleasant it sounds, but unfortunately almost nobody on this planet is like that.

This research is very positive and useful to get people who are currently doing 0 minutes of exercise a week to do 30 minutes of exercise a week, it flies in the face of a lot of "if you don't exercise for at least x minutes a week, you might as well not be exercising" bullshit.

30 minutes of exercise per week (it doesn't really matter if it's high-intensity or not) is really much much better than 0.