Thanks, but the episode aired out of the original block of episodes, several months later. It had different opening credits and different end-credit music, it aired at a different time, and it's set outside of the show's current continuity. (since the last episode had Myka quitting). The Season 2 Wells main storyline is certainly complete without this episode. She's not even mentioned in this episode.
So it's not the same storyline. I'm not sure what you mean by the same people. It's the same show, so you're going to have the same cast.
Plus, as you say, it's not
a normal episode. The normal episode listing is for normal episodes. The Special function is there in part to differentiate normal episodes from "non-normal" episodes. This was a Special episode, it's listed as special.
This all makes it a special by TVrage's admittedly loose standards for what constitutes a special.
At the end of the day, there's no clearcut "right" decision to make. There's some stuff that argues one way, some that argues another. There's going to be people unhappy no matter what. Rest assured this isn't the first time it's happened, and we've considered all the factors.
You can certainly contact the site owner, Sebrioth, if you'd like to pursue this further.