For what it’s worth, their statement lines up with what I monitored - i.e. MGM still had IIS servers etc online when this incident began, but on the dates they’re talking about almost everything plunged offline. 

 This is also a good write up on the MGM thing: https://www.bleepingcomputer.com/news/security/mgm-resorts-esxi-servers-allegedly-encrypted-in-ransomware-attack/