I might have seen LISTINGS like you are describing:
and I am not being a smart___.
If the House has burned, is not habitable and not fixable, they will try to sell it as land with a house that needs to be demolished. You cannot and may not fix that up!
This is very hard to sell, because you would first have to remove the old house.
This is probably one of those things that you don't want to touch with a ten foot pole.
When something sounds too good to be true, it usually is.
Good luck and may God bless