Not 2100g, but probably 1600g
It can generate 200g more thrust per axis (800g vs 600g of old motor with 9443). The 800g of extra thrust translate to about 400g of more lift capacity because you need 50% reserve for maneuvering and stabilization. This would give the total take off weight of 1600g vs 1200g before. The 1300g figure before was on the high side and DJI had to bump it up because they cannot market the p2 being overweight out of the box.
That being said, flying with 1600g weight will definitely cost you in terms of battery life. The extra energy needed to lift those 400g will have to come from the battery. You'll just be able to do it and fly safety for a reduced amount of time. I would expect a 30% reduction in endurance compared to 1200g auw.