An alternative alternative view is that the pyramids are >4000 years old and 20 years is nothing in that context, so waiting a few years for technology to improve to the extent that they can be confident that the archeologists can do an investigation in a less invasive way that doesn't cause damage is time well spent.

Fibre-optic endoscopes have been around since the mid 1970s. So technology that is much older than the muon scanning techniques that the ScanPyramids project used to discover the North Face Corridor. The real problem, I think, was that Hawass went on record to reject the ScanPyramids results for reasons known only to Zahi Hawass, despite widespread scientific acceptance of the ScanPyramids papers.