In the very least, it would be a hybrid of strains. For example a "pink" ( or 'golden') convict X Regular con is a kind of a hybrid; a hybrid of strains. Any cultivar of plant crossed with another cultivar is a type of hybrid and is called so. Pumpkin X squash, even if they are both the same species is called and considered a hybrid. Similarily, one breed of dog crossed with another breed of dog is a hybrid of strains. NOT a hybrid of species, but a hybrid of strains.
Now a midas cichlid is now classified as many species. Currently around 10 species or more; maybe eventully 40 or more species the way ichthyologists are classifying fish now days :lol: Is your barred midas a A. xiloaensis or maybe a A. sagittae? Or maybe one of the more recently described of the midas-cichlid complex? :lol: Who knows? Of course a lot of aquarium strain cichlids that use to be considered to be one species might be, based on the current classification, crosses of closely related species: convicts, JD, severum, festivum, blue acara, jewel cichlid etc.
Aquarium strain midas/RD are already, usually, a cross of both midas and RD. From my perspective the different midas cichlid type fishes are so similar that they are nothing more then different strains. Even midas and RD, from my perspective are probably nothing more then different strains. But ultimately the ichthyologists decide and like to split fishes up into seperate species, over small differences. So yes, even not considering its possible RD ancestory, this cross probably would be a cross of species; if it isn't yet, just give the ichthyologists some more time to classify more midas cichlid type fishes and it will be :lol: