Whatever is going on, is the typical “too many moving parts under the hood, and something got mixed up.”
Do you know what a border gateway router is? That is the network of routers across the world that directs data packets from the origin to the destination. The outage has been caused by all of the routes that Facebook uses suddenly deleted from the network. Therefore, the Facebook origin servers naming is useless if all the Gateway Routers at Verizon, AT&T, Level 3, etc., don't know how to deliver the data packets.
I was once one of those Verizon Techs before I retired. We had bays and bays of Border Gateway Routers at the South East Regional Junction facility.
Learning on the fly, so "no," this part is new technlogy to me.
In addition to directing the data, the DNS part is hosed too - and that would happen if all data packets (including DNS requests) can't get to the authoritative DNS nameserver - and FB is its own authority for that.
Could it be as simple as Z just wanted to pay 5% and not 10% to the big guy?
I’d like to send a bottle of Glenlivet to whatever genius pulled this off!