your vid isn’t showing up 
(i think this site doesn’t like links from your youtube hub, but is okay with links to non-youtube hub vids if that makes sense)
i haven’t seen the vid… but my understanding of front squatting is that you don’t want to aim to sit your butt back (because then you will need to lean your torso forwards in order to keep the bar over your midfoot so you don’t fall over - then when the weight gets heavier you will lose the weight forwards). rather, you want to sit your butt down between your legs (hips above ankles) aiming to keep your torso as upright as possible.
here is a thread where i asked about it early last year: