That "it's all about technique" is so BS.
Been also thinking about what the hell happened, since when I first discovered pinch harmonics at late 80's, I had no problem getting them out whenever I wanted what so ever.
And back then I had way more cr@ppy equipment, then these days.
Now I have several decent amps (Transistor and tube) and guitars with BKP pickups (one of the guitars I have used since late 80's) and find it hard to get decent PH's out.
And I don't think that I've mysteriously lost my "technique" during these years.
Originally that guitar that I've had all these years, had Duncan JB in bridge.
At some point I changed it to Dimebucker, and it was horrible.
Then I ordered Miracle Man and the sound was amazing.
Still, the pinch harmonics were almost impossible.
Few days ago I tried my newly acquired Epiphone Les Paul custom, with stock pickups with my gear and strangely PH's flew out like back in the days.
I am going to upgrade that Epi's pickups to BKP, like my other guitars and see what happens after that.