Locked Anti Phase PWM and BLDC makes sense?
but does it make sense to use it for a BLDC, e.g. 3 Phase Motor?


No, it doesn't make complete sense because, in a three phase motor drive, one half of each of the three H bridge drives can remain at DC bus voltage or bus ground per AC half cycle and hence you reduce switching losses. Preferred way at the top: -



You can still drive the motors with anti-phase PWM if you want but the losses will be greater for no clear benefit.