The reason for traditional cardio for bb’ers is so the can control their heart rate and focus primarily on beta oxidation (fat burning zone) without burning through precious muscle glycogen which will happen with heart rates in the higher range.
Hiit can be more effective at fat loss than steady state cardio, but it’s a fine line you’ll have to play with.
Too little and you won’t have maximin fat loss, too much and you burn through glycogen and effect size and strength.
It usually ends up being easier to just walk on the stair master for 20min every day.
If you have a trainer ( which if you’re serious about B.B.’ing an lifting you should) it can be easier as they can keep track of the times ( rest and work) and push you.