I was LTTP but tried anyway; ended up using two variants on my gmail address. It mailed me a note with a blank line where the promotion code should be.
Today I got mail from the promotion saying they apologize for not providing a code at the time, but HERE HAVE THIS. There was a new code for each of the email addresses I tried, but after successfully redeeming the first code, for the second code it said YOU HAVE ALREADY REDEEMED THE MAXIMUM POINTS FOR THIS PROMOTION.
...So. Looks like they shut it down when the noticed the 4200 points people, and tied the redeemable codes directly to the promotion, which is pretty smart.