well given that a front to fakie and a tantrum to fakie aren't the same trick, i'd have to disagree with this.
however you're right, it would have to be tantrum, then fs 3, just like the tantrum to fakie is a 180 after the tantrum rotation.
im sure it's possible to do (tantrum --> fs3). not easy, but definitely possible. but as i mentioned in another thread, might not be very pretty.