<strike>I'm running uBlock Origin and still getting the notification about adblocker. They seem to be running some sort of detection mechanism.</strike>
I was running standard uBlock and didn't realize it. Origin seems to bypass the detection.
Hrmmmm, running uBlock Origin 1.7.2, and got hit by it.
Go to µBlock Origin settings, 3rd-Party Filters, check "Adblock Warning Removal List" and "Anti-Adblock Killer | Reek".