That is absolutely a dark pattern if that dialog box was intended to speak to read/write access of messages.
"Access my data at any time" is truly deceptive. The icon is one specifying "time" - a moon in the dark; night time. And the operative context seems to be "at any time". However, the grant is actually for, "data". Which is itself seemingly already being granted by the above "Posts", and "Public Information". If Facebook presumed that "data" included everything, then why did they ask for access to posts and public information above?
It is clearly deceptive. If they thought what they did was in the right, then why deceive? And if they felt like they made a mistake, why not make the new dialog boxes not deceptive?
That they do not feel that they can sustain their business model without being deceptive makes NYT articles like this all the more necessary; if people really don't care about their privacy, then go ahead and ask for their privacy - don't dance around and say you're providing a service (and omit that you're also taking their private data). If they asked clearly and they were granted the ability to farm out to third parties whole read/write access to all data, then I'd be more inclined to believe that their users were actually acquiescing.