Debating whether to post this on the “If Jewish writers are so good, why don’t they publish secular?” thread, but there’s way too much controversy there. I actually dreamed of publishing a sci-fi book for Jewish teens as it is something I believe is missing from the Jewish world. However, anyone who heard this idea said to scratch it as it would never pick up. All everyone wants to read about is shidduchim, marriage issues and kids in broken homes. So I decided not to waste my creativity in that venue and channeled it elsewhere.
But back to the OP, I for one would definitely would be very interested in this Jewish Harry Potter book, but after googling it, I don’t think it will be accepted in our communities at all. From what I read it doesn’t seem to be mocking at all. It’s just a totally wrong perspective of Judaism.