It actually does move. I didn't realize which was the 2015 MBP at first because I was looking for the trackpads that didn't give well the new ones do seem spring loaded but not hinged. I doubt the reliability will be much different. There is still a pressure sensor in place of switches
No, it doesn't move. It's all the effect of the vibration that gives the sensation of movement. Power down the computer and try it, it's just a flat, immovable surface. Don't spread misinformation.