They probably mean the hard drive has 10 platters, each containing at least 3TB.
This article is talking about domestic sales only (which means only counting money from US and Canada). It's a combination of the domestic grosses of Deadpool & Wolverine, Inside Out 2, Moana 2, Kingdom of the Planet of the Apes, Alien: Romulus ,and Mufasa.
Including worldwide grosses, Disney made ~$4.3 billion.
Baby, you'll freeze out there...