"A5 similar to what Gibson standardized on in late 59 through the patent days" -
The Legacy is one of their 1959 - "Constructed of period correct materials right down to the maple spacers" but with an A5 magnet, hence why I thought your descriptions seem to match.
The tone seemed similar to me in that clip as well but you know how that goes.
Idk about where homeboy gets his plastics or anything like that, I just know that the pickups I have tried in various guitars have beat out/replaced big name stuff like BK, Gibson, and DiMarzio.