My DD was a really early reader (she was obsessed and followed me around with books in her hands) and I was perfectly happy to take credit for doing the time and teaching her, until a friend asked me to teach her toddler son too, and he just stared blankly at me. I then realized it wasn't my fabulous teaching skills (lol) that resulted in my daughter's early reading, but rather her voracious fixation with it.

I'm not really sure what the real definition of hot housing is, although I do agree that it's connected to a lack of interest on the child's part (excluding 2e therapy/support, obviously - that's just good parenting).