Doesn't matter about the post, because you can NOT put power and LV in same conduit = PERIOD!
So now you need to pull a 2nd conduit for your LV. If there is a way to bring it up inside the post, then great. If not, then attach it to the outside of the post coming up (paint it if you need it to match better). Might also use metal wiremold instead of round conduit coming up and paint that.

I to would recommend pulling a pre-terminated fiber (that short of run is dirt cheap). Plenty of room left over, so I would pull a 2nd fiber and that cat6 also just for backup. Wouldn't hurt to pull (2) 16/4 speaker as well - you know when he finds it hard to hear and wants to add that outdoor sound bar.