Really think we should all give Iberia some slack here and stop calling them.
All their communications (apart from stressed call center employees) appear to indicate they will honor the promo. No backtracking yet. They even stated they will honor the promo if booked via the app, even though the T&C's said you needed to book via the website.
90.000 miles is enough for a business class return flight to virtually anywhere, no wonder they don't want the same person opening 92031 accounts.
90.000 miles for EUR < 300 + sending a copy of your passport sounds like an extremely good deal to me.
Also, just imagine you had been collecting Iberia Avios for years and almost had enough to book a flight....