Banning messages via NetzDG is on message basis, that means single tweets get removed.
Here a whole account got banned which is twitter SOP when accounts violate their TOS.
Because the new NetzDG came into effect this month now every media in germany is confused. Seems like the international ones follow suit.
Also the Titanic account (the satire account) got - wrongly - banned some time before so it propably was some kind of repeat offender thing