He says so right here. “Those who are not parties to the suit are not bound by it,”
And here.
“[O]n a great many issues, others have largely acquiesced, even if they were not parties to the case,” the 2016 presidential contender added, “but there’s no legal obligation to acquiesce to anything other than a court judgement.”
I take it to mean that there is no court order directing all of the states to comply. The existing ruling is only binding on the parties actually litigating.
Of course it is obvious that the minute someone sues another state for going against this decision, it will trigger a lawsuit that will eventually have to be settled, but I think that is the whole point.
Don't roll over. Don't make it easy. Cause them trouble and defy them at every turn.
He is giving his legal opinion.
He is NOT giving advice to ignore the ruling.