If you read the rules you can see that the 2020 Delves update basically makes the individual Shadow Tower boss runs irrelevant to track on this board since they are now just the bosses. The game already implements in-game leaderboards that track boss times. There's no compromise for this sadly.

The game has in-game leaderboards for boss kill, just like I said... RTA would just be adding in load time which makes no sense. Your best times are tracked within the game.