Not a full pre-bend, the whole step bend is very quick, sounds like the pinch harmonic hits a split second after the bend starts and then it’s released into vibrato.
I agree that he half misses the pinch harmonic, 2nd fret on the A string. Quick bend up and release the bend into vibrato.
Here’s my take on a Les Paul:
Harmonizer, reverb with pre-delay also help on the studio version.