I saw you managed to remove the RTA from the leaderboard of certain categories. I wanted to do the same, but did not find a way to do it.
I'm aware I can remove it from every category and only have one "Time", but I want to keep the RTA for the glitched Speedrun of Goop Loop.

Removing RTA on these boards is just a case of none of the runs having anything entered in the real time column when submitting: once none of the runs have real time, you can disable the real time column showing entirely with the "Show empty time columns" switch under edit game.