Well, for anyone interested, I can now confirm from personal experience that this does STILL work (as I thought it would) on a 2014. I just did it on my '14. Took more time to find the darn button and LED than to reprogram. First time, I just shut off the door open/key insert shutdown option. But then I said, what the heck, and set the runtime for 15 minutes from 10. Literally, this is EASY. My button was taped up next to the remote start box, just to the right of the power pedal height adjust button. I had to remove the kickplate trim under the steering wheel (3 7mm bolts) and then the trim plate that holds the power pedal button. I was able to reach through the hole in the sheet metal where the power pedal button goes to access the remote start programming button. I LOVE it now.
One thing I did read somewhere was that the remote start may be set up as a restricted MYKEY. I went through the MYKEY settings and confirmed mine was not. It's an admin key. Cool.
Now to find out if I can use that 5 button key. I'd love to get rid of the extra fob for the remote start.