Wow that is really annoying that I can’t figure it out. Slight of hand??? lol! There must be an answer. When I slow it down I feel (and mute audio as there seems to be a one note sync issue on the YT player at the slow speed) I feel like I see him doing 2 downstrokes in a row, on one string. That would make the picking
|---------16-19-18--------16-19-18
|-16-19------------16-19-------------
D D U D U D D U D U
And you’d have to swipe to make the change from the b to e strings. That can’t be right though. It feels way to choppy to play that way and he looks pretty relaxed. Sorry for the (probably) no help, color me confused!
If you held a gun to my head and made me play that exact phrase, no slurs allowed, I would do it like this:
|---14-16-19-18
|-16------------
D D U D U
Nice little 4 finger circular economy picking lick!