In flight, after turning off PRIM1, 2, 3, the plane is in direct law.
Looking at the PFD:
Alpha lock still kicks in and increase thrust to TOGA. Autothrust is still engaged (white).
Also, on the speed scale, Alpha PROT should not be available.
Alpha Floor, alpha PROT, auto-thrust should not be active in direct law.
I have done UPRT training in a A350 level D simulator.