Prolly Not...
The first 4 notes are probably played in groups of 2, with the LH fingers quickly "rolling", a kind of "micro-slide", to the adjacent string for the upper note.
That is, after the first 2 notes, he shifts up on the D string to grab the Bb (and Eb). The rest of the phrase is just ascending the G string.
He might grab the first 3 notes before shifting, but that puts the shift up, on an off-beat, and makes it a Triple Roll on the A,D, and G strings. I'm not sure that it makes it any easier, but he is Drew Gress, and I'm NOT!
Barre-ing on a DB is not a very effective method - you CAN do a kind of "roll" of the LH between 2 strings, but it is not simply just barre-ing - you also need to focus on 1 or the other note with the LH - you can't just clamp the LH down and get a full stop and full tone on both/all the notes.
IMO.