1) You have no way of knowing one way or the other who's on the other end, and history is no help. I've commented here that people who invoke Jesus seem to be getting a wide range of different beings, some of whom are decidedly malefic. The antecedents of Hu are very uncertain, like so much in the Druid Revival tradition; we simply don't know where Iolo Morganwg got the tradition that he was the great Druid god, or what he might have been called in past ages, if anything.

2) Fair enough. My experiences with Hu the Mighty suggest that there's something much more than an artificial elemental there.