That could also be the lobby of a joint intel facility between the NSA and Saudi's or a target of their collection.
https://www.aclu.org/other/nsa-intelligence-relationship-saudi-arabia
The Deep State would have motivation to take down the current crown Prince and the Khashoggi killing very well may have been that kind of setup. If so, the joint NSA/Saudi SIGINT capability may have evidence of the setup. When they say "We know" after the cryptic string, that may be a reference ID to a specific piece of SIGINT that was collected.