The assertion is made that the glass expanses could not have been made by comets or meteros. In fact, the right composition of object screaming in to the atmosphere at a certain size would explode prior to impact and the heat released could certainly have made glass expanses. By starting the question with a specious assertion, conspiracy is supported ... speciously.
As I wrote: I don’t generally believe this stuff but I keep an open mind about it and it is much fun to read about and speculate on.