What they hate about Chinese internet censorship isn't the scope and pervasiveness, it’s who specifically controls it and what specific decisions are made.
I'm guessing you mean blocking their entire NS host. It would be a massive overreach and would block every site they're authoritative for.
It's one more thing on the rapidly growing Unconstitutional=Okay stack. Cherry-picked courts are routinely fine with that. But it wouldn't stop lawsuits from registrars, site owners and other parties harmed thru collateral damage.
Just blocking PH's current IP would take down over 40 sites.
Actually they've already pre-emptively blocked themselves. If you try to access their site from anywhere in Texas, you get a wall of text urging you to call your congressman and oppose this law (or so I heard from a guy).