I am only mortal but will give it a guess.
Am not really sure which part your after. 6mins 41secs of bliss and half way through the track I hear a piece of software called vocalwriter. Is that the vox effect you’re after.
I got a smiler effect from automating the delay time on a chorus plugin. 04:07 in to the track “silly string theory” on my artist page. Not exactly the same but I didn’t have that in mind at the time. Less drum l;like but with a little tweaking I’m sure you could make it quite like the posford effect.