Ummm...nope.
Just tried it. Turned on AP(1), took it up to 90mph (the upper limit) and then pressed the accelerator for about 3 seconds to push it over 90mph and without hesitation, I got the big red hands that said "take over immediately" and AP disengaged. TACC stayed engaged. AP could not be re-engaged until I stopped the car. The blue lines had completely disappeared. Any attempt at re-engaging AP resulted in the three bongs and the yellow/orange icon flashing three times. At no point after I exceed 90mph was AP or auto-steering enabled, or able to be re-engaged.
There is absolutely NO confusion here.
If the difference is AP1 vs. AP2, then that clearly points to this all being Tesla's doing..as if it were regulatory, you'd think they would both behave exactly the same way.