The Post still hasn't deleted the offending tweet. Those are the rules: on a first violation of posting someone's personal information without permission you get your account locked until you delete the tweet.
So why is the Post's account still locked?
More generally, it does not appear Twitter is impartially enforcing standards against leaking private information. There are no problems posting stories to Trump's illegally-leaked tax returns, or Melania's phone calls, for example.
They've chosen not to delete for either "moral" reasons or "moral outrage" reasons, but the ball is in their court.
It is a better advertisement for the story, and worse for Twitter.
The irony of a giant company like Twitter falling for the Streisand effect is rich.