What I think is different concerning True Step and RPM is that with TS they seeming couldn't overcome the engineering hurdles necessary to apply it to all players in the game all the time without breaking the game, so they had to abandoned it. Looking at FIFA it seems like that issue doesn't exist with RPM.
It's logical for most people to be super skeptical of any and all claims of improved player movement in Madden, but this Tech might finally be the real deal for Madden.