How does boiling impact the texture of tofu?
Ah, so the question is "Why does boiling the tofu change its texture?". Answer: it doesn't. Try doing this recipe without boiling the tofu, I think you will find it is pretty much the same. I think if the boiling serves any purpose at all it is to remove any last remnant of taste from the tofu. I don't mash tofu often, but when I do, I never boil it and I've never had a problem.