<<<You are completely missing the point. No other ISP is using RIN.
No, the customer was a Plusnet Customer not a BT one, what part of that is so hard to understand?
I concede from your explanation, that no other ISP uses RIN, but that does not rule out that BT could have made the same error on any other of their broadband networks, or have BT re cabled all the exchanges to give different scenarios, just in case this was ever to happen?
<<<With respect to Phorm Plusnet have made their position clear time after time and the Register correctly stated it.
With respect, PN have said in the past that they would not implement it, yesterday, it would appear that they stated, "and has no plans to at the moment"
That's a big change of stance, and where I come from, no longer rules it out as a possibility for the future.