Sure, but unless they explicitly condemn PA a court might find it "reasonable" to assume they are supporters. Then they have to fight it out in court and it comes down to whether the courts are going to rule in favor of the government or not. At the very least it gives law enforcement the power to search their computers and phones for PA support, so they need to have squeaky clean data hygene.

There's a real chilling effect on all Palestinian solidarity, even if technically this should only apply to PA specifically.