In retrospect i don't think he called it JKD per se but it does have some JKD techniques. Mostly Fillipino Escrima/Dumog. Still pretty damn fast for his age.
I remember the balisong knife craze - had a few knives myself + a few scars to go along with 'em
there is no such thing as JKD techniques.
JKD = fighting. Everything is JKD and JKD is nothing. It's what he said himself, if you start calling this and that JKD, stop using the name, as it is just a name.
Form is emptiness and emptiness is form. 色即是空、空即是色