The aerodynamic center moves under compressibility increasing the stability margin.
Two common methods of handling this are:
1. Add drag to slow the aircraft down below compressibility
2. If the CG is within limits<for that condition>, the aircraft will recover.
If you want to make the elevator effective enough to recover the aircraft, it must not violate the forward CG.
The forward CG limits defines the point you can raise the nose.
Under compressibility, behind the normal shock, the dynamic pressure is greatly reduced and the flow subsonic.
I am sure Mtt was aware of this fact.