I've got a service manual and that's what it says too. I just feel like I'm hitting a flat metal surface no clicks or snapping going on and tail light isn't moving. Feeling quite ignorant at the moment lol
Relax! It is easier to remove the passenger seat, remove the rear fender, look at the clip and how it fastens, and then remove the taillight. The next time, you will be able to do it confidently, and not screw up paint or sheetmetal. How do I know? I had the same issue! Could not get the friggin thing off! This was pre-forum, so I had to ruin some paint to figure it out. Don't. 2 nuts on the seat, 6 on the fender. Mystery solved!
Good luck! Joe