You should read the article again. The API is there, it is working, but only for four selected applications. They are all Apple applications. Here is the quote

You should read the article again. The API is there, it is working, but only for four selected applications. They are all Apple applications. Here is the quote, it might help: Say what?! Did Apple seriously grant access to four of their native apps by hardcoding their bundle identifiers? Yep, they sure did².