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by pvg 2896 days ago
The Network Extension framework mentioned in the post is that API. It's been an iOS thing for a while and came to macOS more recently (10.12, I think).
1 comments

The docs say 10.11 for most of the APIs. A few are still (and forever?) iOS only.
Yes, I counted counted versions/WWDC videos wrong - the macOS version popped up in 2015 along with the El Capitan/10.11 announcement.