There is a great YT channel called “History For Granite” that discusses the pyramids. His (and many others)posit that Zahwi Hawas, who is (or was) the director of antiquities in Egpyt, is a roadblock to many studies because they may differ with theories that he has backed. Bascially the guy has extreme bias.

There is technology that can use existing alterations that have been made to the pyramid (drilled holes) to explore the void you are speaking of… but Hawas wont allow it. He has denounced valid research as quack science, even when it has been vetted by other researchers… again due to his personal bias.

While I agree somewhat with the supposition that Egypts ancient history was plundered by the west… Hawas, from what I can tell, just basically blocks research for no real reason, other than he doesnt want it to happen.

I am sure there is more nuance to the situation than this… but this is what Ihave put together… However, I am about as far away as i can get from being a scholar on the topic.