I think the article is saying Twitter banned the account at least partly as a consequence of the legislation, because they were worried about being fined.
That does not make sense whatsoever. They should have just hidden the tweet then. They have built technology for that - I have seen some tweets that got banned because of the NetzDG. The law is very controversal and is making waves in germany. This article just chose a terribly example - but then again thats propably iconic for most of the fears about this law.
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