If this is back, I'll update next week upon my return from JFK, since that claims Oro customers in any class on IB longhaul can use it.

However, I wonder if that's just an old webpage – it's not in Iberia's current website style and the main VIP lounges page does not make any mention of the arrivals lounge. https://www.iberia.com/es/iberia-madrid-vip-lounges/ That page linked/screenshotted above also claims Dalí and Velázquez are 24 hours, which they are not.