As far as I'm know they were produced. Although I'm in the same boat and have never seen this version since their release. Which leaves me to beleive that they are either still in unopened boxes (not that likely being that there was only 15 of them you'd think you would have seen at lease 1) or never put into packs which seems very common for UD.
I've seen every other olajuwon version bar this one, only the pic you posted from the UD site. I have been waiting for these to comeout via UD replacements or Buyback etc but this hasn't happened either.