Actually - I maybe wrong here and would like to get a second opinion.

According to https://en.wikipedia.org/wiki/Buffy_the_Vampire_Slayer_(season_3) which we all know is not gospel and always subject to confirmation, however there is a reference for the earshot episode saying This episode was originally scheduled to be broadcast on April 27 but was postponed following the Columbine High School massacre on April 20, 1999.. I wonder was that just in the US and if the episode itself did air elsewhere in the world, for example the UK ?

Regardless, if this is true and the original first worldwide broadcast of this episode was in Sept and not April then the changes preformed by the other user would have been correct. I think it needs a little more investigation.

TVDB fooled me because they've got it listed as April 21, 1999 as well, and locked it. Though after a second look at it, even that would be incorrect as it would've been aired on April 27, like you said.

Here's a newspaper article saying it got pulled: https://i.imgur.com/GGngs6C.png

And a listing that says it will air on September 21: https://i.imgur.com/PQBB3D9.jpeg

I moved the episode and locked the season.