I respectfully disagree. First of all, Rashi says specifically that one who was not there the previous day is panim chadashos. He makes no other stipulations.
Furthermore, in my opinion, there are too many interpretations regarding panim chadashos to call it halachah. It is minhag. The prevailing minhag is that you do count. Besides, you may not yet know the chosson and kallah, but you’ll get to meet them. I’m sure they will be happy to meet someone new, and that is enough l’samcham. Win-win. Go and have a good time.