Maybe these are mostly too new, or you have different (more practical, hands on?) definition of tech-talk - but from a quick look the only speakers I expected - and found - were Sandi Mets and Rob Pike.

If it's practical, I'm surprised not to see the js "wat" lightning talk (which I now can't seem to find...).

If it's more general "best of", I'd expect something like Guy Steele "growing a language" : https://youtu.be/_ahvzDzKdB0

Douglas Engelbart "the mother of all demos": https://youtu.be/yJDv-zdhzMY

Alan Kay "doing with images makes symbols": https://youtu.be/p2LZLYcu_JY Or, if that's too long, the much more condensed ted talk: "a powerful idea about teaching ideas": https://youtu.be/Eg_ToU7m1MI (Maybe that's not a "tech talk"?)

Rich Hickey "simple made easy" : https://youtu.be/34_L7t7fD_U

To name a few of the top of my head.