That's misunderstanding even the basic issue here. Segwit signaling needs to begin August 1st, it won't lock in for about 2 weeks and that has nothing to do with the 2x part which won't even happen until November.
Incorrect. NYA begins locking in Segwit as early as July 21st. The point is to get Segwit locked in before August 1st so the UASF has no chance of creating a second chain that has any chance at life. You are correct that the 2x portion will require a hardfork that will presumably come down the road.