Yeah, if they had just blocked his mac address then he could reasonably think "hmmm, I can't connect with this mac address, I'll try a different one" instead of "I am no longer authorized". But if you have to keep reconnecting with different IP addresses and mac addresses over and over again, and finally resort to connecting directly to a wiring closet, then the message is pretty clear that you (not just your mac address) are no longer allowed on the network.
It's clear that someone doesn't want you to have easy access, but it by no means gives a clear message that you aren't 'allowed'. If I set up a wifi portal that flips images upside down and misspells words and all that fun stuff it's clear that your access is being diminished but by no means says I want you off my network.
