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This guy seems to get it.

For the lazy:
- the paper uses no new data
- absence of known structures that should be captured
- what their algo puts out doesnt resemble the silly pictures much

Think about it. Are these massive but intricate structures even feasible? Wouldn't they collapse without any upkeep? What about drainage? Let's be real. If every sucker on the internet could image actual DUMBs thousands of feet in the ground just by processing commercially available radar data we'd be discussing much more interesting stuff than antediluvian parking spaces.

All in all this seems like some gay op designed to give skeptics more ammunition to shoot down legit discussion of the pretty well established series of tunnels and caves which litter the plateau. The existence of these tunnels and shafts is well documented. That these structures probably connect into some maze like underground temple comlex is still considered controversial though.
However other such structures are attested to have existed in Egypt.