Nice interview, quite a few things to talk about. I guess I missed the episode about astrology (or did I misheard there was one?). I started looking into astrology after reading Jung. Modern western stuff (at least what I saw) is sooo fluffy and vague, ugh. But after seeing this episode with Alex's frenemy Shermer
I started looking into vedic astrology quite seriously. It is actually very complicated, has a lot of "left-brain" stuff; quite fascinating actually.
As I understand it, at least in the tradition that I am following, stars are a reflection of the part of your karma you chose to deal with in this life time. It is not really written in stone, there is room for free will (otherwise how would you create new karma?), but it does lay our a territory so to speak, some more difficult and fixed, some less.
There is also something like "as long as you incarnate, you will keep creating karma, even if you are a saint". Only if you are ready and say I had enough, then you can merge with the absolute (I probably distort the teachings as I am total noob in this area).
So as I see it, stars do not really fix your fate, at least not in a fixed literal sense. That it is at all possible is not that surprising if we really are parts of one big consciousness - all is sort of entangled. However, it is still weird that you would have clues in the sky as to your tendencies and life circumstances - maybe the kind Supreme has left such clues to escape the Gnostic archons, i.e., understand and improve ourselves. Who knows.