Question about the Metabolic Challenge Pace

The 30-10-30 metabolic challenge state to reduce the time between sets from week to week, but why ? It is said that it enhances muscular growth, but does someone know by which mecanism ? I ask this because it seems pretty unusual as most programs advise for longer rest between exercises and I didn’t found studies on the effect of a reduced rest time.

I just started the program by the way, feels great even if it’s unusual.

We are after the conditioning effect more than muscular growth, so moving quickly between sets is important.