IMO your message shows why no lockout for excessive speed should exist... the system does not understand, thus it should not be the judge of manual controls or manual corrections. When the driver makes a manual correction, AP should just stand aside for that time.
The system as is encourages to avoid even momentary speeds exceeding 90 mph, while the system at the same time is lacking understanding of the traffic situations in which it does this encouragement. This is not a good thing.
APs responsibility could easily be absolved by disengaging at 90 mph. That is fine and understandable.
Nobody has offered any good reason for the lockout in this scenario IMO. Lockout for missing nags is a completely different (and understandable) thing.