If they extend when airpressure is reduced as airspeed slows, then it
would be redundant to add "also when a certain AOA is achieved"
because that is the inevitable, inexorable, undeniable result of
slowing.

I was thinking of maneuvering. The A-4 slat would extend up to around
350KIAS once the proper AOA was achieved ... hardly slow. I suspect the
various NA products behaved similarly.

R / John