It's a known tech that wasn't applied for this case, a better strat is known anyway for this track so it wouldn't be useful.

The no shortcut category requires you to go through every single piece of track (offroad excluded), here you would effectively ignore a small section of the track which makes it a cut. So yes.

If you're unsure as to whether something is ok or not, you can check out the current no shortcut runs for a track and see what can and can't be done.