There is a video of july 2018 in which is mentioned right in the beginning something about the author (Michael P) saying on discord he'd like to rewrite the mod someday, since it wasnt functioning properly. At first it was avaiable only at parkitect nexus, so I cant confirm he 's the one specificaly who uploaded it to steam workshop. Whoever it was, probably removed it because of constant complains on the comment section.

https://www.youtube.com/watch?v=v6hX18DU1pA

That's sad to hear.

Is there any place where track edit can still be downloaded?