As the article you link to is about the question of whether they could jump to humans, I'm not sure it is particularly relevant (there have been many cases of introduced species creating trouble, yet none that I am aware of did so by targeting humans, and if one did, it would presumably be a concern in its natural range as well. The concern here is that if the fungus is introduced somewhere new, it may either attack important endemic insect species immediately, or evolve to do so.)

From the sources I looked at, it seems to be a matter of fact that E.muscae infects multiple hosts. Furthermore, does the fact that the genus Entomophthora contains many fungi which collectively infect many species not suggest that they can, and have, jumped species? It seems implausible that, just within this genus, each of its species independently evolved to target one host, and a species that can do this with one host would seem better positioned, compared to any that do not have this capability at all, to evolve into something targeting a different host (the point is that all these different Entomophthora evolved from something, and it is most likely a single common ancestor with the ability.)