You're missing the point being made. We are not saying "it cannot be enforced, period". What we are saying "you cannot police every single website on the internet." Thus what will happen is this law will be used as a weapon to target sites that publish reviews that paint a particular product in a bad light, or user contribution sites that compete with big social networks. Or even, in the worst case scenario, forums which are critical of a particular government party.*
A law like this can and likely will be selectively enforced since it will be impossible to police every single independent thought published on the internet.
* I appreciate those points may not be in breach of the new legislation per se. But there is a pretty good chance that some content on sites of those style would be in breach. So it's a little like police using a broken tail light as an excuse to stop and search a car.
