Earlier quoted context omitted.
Shockwave Rider is interesting because of how early it was and how unique at the time. That doesn't establish a subgenre though. Cyberpunk wasn't coined as a term until right around the same time as Neuromancer came out and Neuromancer swept the big sci-fi awards, making it a fair thing to say that it 'helped to establish'.
Brunner is amazing - far ahead of his time.
Still a great read though.