Judging by the downvotes, the last sentence was indeed correct.

Absurd stylings aside, I do wonder if the sorting hat doesn't have the ability to circumvent the interdict of Merlin, and whether or not Harry's exposure to the spell Fred Weasley used to summon it is sufficient that he could replicate it and ask it for those secrets he missed out on in chapter 10. He did ask Dumbledore about the sword (and the heir of Gryffendore and such), so I'm not sure if this falls into the category of resources he hasn't considered, or resources he has decided not worth pursuing.