"a person being detained because of an articulable suspicion of criminal activity may refuse to identify himself."
Don't make a fool of yourself. In the context of a legal ruling, "a person may do X" means "a person may do X without being legally punished."
Nonsense. Particular conditions were attached to the waiving of sanctions for refusal to ID. It puts the burden on the police to obtain the persons ID some other way. If they are unable to ID the suspect any other way they should keep him until they are sure he is someone. If they can't determine he is someone, they should declare him fruit and toss him in the recycling bin for composting.