I did it the same way in that video. I took the entire stick out and slid a flat head under the black tabs and loosened each one, then pushed each side in just a little bit until eventually they all came off. It was easier the first time, but for some reason when i wanted to switch back to sqaure gate (was putting the GT-Y on my HRAP 3) it was even tougher.
If you do get it off make sure you take a razor, knife, whatever and cut the edges of the tabs down so it won’t be so tough next time.
And yeah, i have a JLF on my HRAP 3, pushing in the tabs was much, much easier.
Good luck, and don’t break anything. And if you do, well, just get a JLF of LS-32 anyway :).