Is there any reason why he said you don't need to touch the floor? For me, it depends on what do you want to achieve from the deadlift.

1. Touch the floor, pause and lift.
-This style will eliminate momentum that you gain from bouncing the bar off the floor.
-This is good for strength training as you'll need to pull 100% using your strength.

2. Touch and Go.
-Improper touch and go technique will create momentum that will assist lifter to lift weight.
-Highly not recommended.

3. Not touching the floor (as advice by TS' friend).
- It will maintain pressure on the targeted muscle from the start of exercise until end.
- Same method as not locking the knee during leg press.
- Aiming for the pump instead for the strength.


This is strictly my opinion that I gather from my observation.