That’s exactly where the clip came from. All clips from the movie in “The Making of Peter Pan” in the 2002 DVD is footage from the 1990 transfer.
The colors and the light splotches on Tink’s dress are the give away.
It’s not uncommon for even new bonus features to use old transfers for clips rather than the restored version on the disc with it.
But yeah, as far as I know, there was no digital clean up until the Platinum Edition. I’m no expert though.