This is the sort of thing that concerns me so much.
Basically all he needs to do is take a special kind of picture of the pyramid yet the powers that be won't let him do it. This would definitely yield valuable information to everyone who wants to know how the pyramids were built. It would even prove internal ramps if they had existed and settle the question for once and all.
But orthodoxy apparently can't handle even the lightest jostling without falling apart so it's safer to keep him out.