Pretty sure they no longer announce failures. Not sure if they officially announced that, or if I just started assuming it, but I'm pretty sure it was in 2019 or 2020 when I noticed that there hadn't been one of those headlines for a while so I started googling and all I could find were state athletic commission failures for weed.
No announcements along with sudden fighter departures, IE Yoel Romero. Suddenly fighters deciding to "take time off", IE Jon Jones.
Basically you can make an educated guess who has failed a test by looking at their fights. If someone isn't injured yet goes 12-24 months without a fight.....they likely got popped.