Note the motion of the gal's trigger finger in the closeup around time marks 0:28 to 0:30. You can see her come up on the end of the so-called "1st Stage," then pull thru the "2nd stage" to fire, which seems to involve about another 1/4" of creep.
You can also see how the weight of the 2nd stage compresses the flesh of her finger.
That's a lot of heavy weight and a bucket full (and you know the kind of "bucket"
) of nasty creep.
To my eye, the SAT looks to behave exactly like Gamo triggers have always behaved, and not any improvement at all. That is to say: The SAT is just marketing hype.