You are correct but the Cp does not 'fall off the back of the wing' as suggested leaving only the tailplane to support the a/c. Modern a/c do not run out of 'elevator' in this situation since they generally have moving tailplanes.and have an 'auto' trim function with Mach No.
How we got to an 'overspeed stall' (whatever that is) I do not know. The OP asked about an 'ordinary' stall and Mmo/Vmo
