From what I've read and heard, the concept has been around for a couple of years now. Different players have been experimenting with different types of the torpedo (wood, balance, taper, etc), and it has been a process to find what "feels right" to each hitter. Cody Bellinger said he used one last spring training with the Cubs, but never in a real game because it just didn't feel natural. Apparently, the Yankees were experimenting with these bats a lot during this year's spring training. I have no idea why no one noticed, or reported on it then.
The concept is an excellent one, you want to hit the ball where the most wood, and therefore weight, of the bat lies. By moving the weight closer to the handle, you are also able to swing the same weight bat faster.
If other teams weren't trying this before, they certainly will be now.
BTW, Aaron Judge said he won't touch one for fear it will mess up his natural swing. And, his natural swing is working pretty well right now.