I can tell you that he is a nice guy but with no morels when it comes to recasting other people's work. All he has ever done is recast other makers armour and helmets. Makerofthings translates to Makerofotherpeoesthings!
Yes your armour is cast from an original set a few generations removed. He used to recast TE then CAP now it looks like RS.
There are only two makers currently selling armour cast from original. That's myself of which is ROTJ and RS which is ANH. I'm the only one that currently sells "cast from original" ROTJ so no real confusion there. ANH is another story.
There is loads of history on here but most ANH armour apart from TM, RS and a few other fan sculpts derive from ROTJ armour re engineered to look ANH and started out as TE then recast by CAP who gave permission for all to recast which gave way for a multitude of offshoots. It's complicated.
So bottom line is that makerofthings sells recasts of other vendors armour and helmets.