Yea it still works, but I'm not sure as to whether or not people can be banned for bug abuse when doing said glitch, I know it's not a HUGE deal and of course it's jagex's fault for leaving the exploit out but you never know.
I'm not exactly sure how it's done but it honestly doesn't matter a significant amount in dueling at all. I've been dueling quite a lot lately and only seen a 116 once.