That is what et means, answered your own question there. When the BP is scanned at the lounge it should say no, but then again if you print your BP with the EK FF number the number is technically encoded, with status, on the BP, if the lounge computer doesn't double-check if that FF number is still on the reservation technically computer would say yes, even if you changed it on the reservation after the fact.

If you can't get BP through OLCI of course it's mute.

If you show your Skywards card at check-in the agent will try to update your number, see your AS number and ask which you prefer.