That wasn't a pilot, or even an episode, it was what is called a "Pitch Reel", which is something a production company who is making a new TV show whips up and submits to various networks to give them an idea of what kind of show they would be picking up if they decide to buy the show and air it as a part of their lineup.
In this case, CTW made this pitch reel to give the educational stations an idea of what they were aiming for with this experimental new educational television show of theirs: the bits with Rowlf and Kermit (and other random Muppet characters) was to poke fun at how they couldn't come up with a suitable title for their new show.
It's a special feature on the Old School DVD Volume 1 set... someone may have it posted on YouTube or Dailymotion or one of those kinds of sites.