Hmmm - I reached the second milestone for ELTA3 a week ago, called yesterday to ask why I had not yet received an email, did not show when I signed in to the ELTA3 promotion (only that I already redeemed milestone 1). Agent said that they are still upgrading systems ("behind the scenes"), I should give it until early next week. After reading this thread, I was again able to register, but the second milestone was still not there.
So while the OP is correct, I would not be surprised if the promo registrations reappear once the dust settles (Monday?).