I read the same thing. Your options are limited with that back, so instead I bought a wireless charging receiver. Many exist for the GS4, and they are pretty inexpensive.
You simply put it on top of your battery, then attach the regular, standard case to the back and you have wireless charging .. The receivers vary in depth, but
this is the thinnest I have found, and the one I use. All of the GS4 cases will fit fine, if the receiver is thin enough (some are not). The one I linked to is super thin, and I can now use any case with it...
Good luck