I am fairly sure that such a bill has about 0.000001% chance of actually being enacted. And, as you point out, if passed, it almost certainly would not pass judicial revue.
In reality, it seems more like a PR move by a politician who is promoting helmet laws, and/or who is rabidly anti-motorcycle.
As for site censorship, I believe that most is done by software, which has the subtlty of a sledgehammer.
eg, you can't use the word p!ss without replacing letters, in spite of the fact that it is commonly used in prime time network tv (not to mention it is used in the King James Version of the Holy Bible). Someone on another thread recently refered to the late, great director Alfred Hitch***** which was censored as well -- guess should have said "Hitchpenis"
Obviously, not a human doing that censoring.