Not true at all. I know quite a few ESB AM armor builds. The armor is spectacular and extremely well built and detailed and exactly the same as the New Hope armor. I built mine to be exact to my Anovos Build. The ESB requires a different set of stickers on the helmet, the frown is black, the belt does not have rivet holes and the holster is a sling loop on the other side and the hand plates are different, of which AM carries all the necessary parts. The stickers, if they do not have them for the helmet, you can get from Trooperbay. I am not sure what they are referring to regarding chest and back plate, and, I can guarantee you they are wrong. Contact Dave at AM and he will guide you through it. Very nice guy and excellent product.
Finally let me just say this, I would not say it if I wasn't willing to back it up as well. I know two other ESB builds at Centurion Level that are AM builds.
If you have any questions, feel free to ask.