I do think to be cyberpunk you need, you know, some cyber and some punk. Those are key. High tech, low life, etc. It is distinguishable from noir and grimdark and even steampunk.
Actually you need more "punk" than cyber.
Stange Day was really cyberpunk with really a few cyber involved.
Ghost in the shell or Deus Ex has a lot of cyber, but not enough "Punk" to be "pure breed Cyberpunk".
I think when there are more "Cyber" than "Punk" it becomes Transhumanism.
Cyberpunk roots itself in inegality, anti-capitalism, etc... so you really need more Punk than Cyber, just a computer, some hackers and Black Flag blasting on the radio.
Nowadays, people often think "cyberpunk" is just an aesthetic when it's way more than this, even Cyberpunk 2020 has a "punk" vibe to it, something timeless very "Fuck the power!" that goes beyond the cybernetics and all.
Well, that's just my opinion.