Note that the only proponent of the man-made theory mentioned is Graham Hancock, a somewhat infamous Atlantis-chasing pseudoscientist and overall purveyor of extremely flimsy "ancient civilization" theories.
That doesn't mean that there aren't also legitimate archeologists who might be excited about these prospects, but the lack of their mention is...suspicious.
To me it's quite telling that even John Anthony West is among those who say this structure is natural. J. A. West was famous for his theory about Sphinx showing signs of water erosion and hence possibly being 12,000 years old.
That doesn't mean that there aren't also legitimate archeologists who might be excited about these prospects, but the lack of their mention is...suspicious.