I was disappointed that the book didn't have much to say about Alpha Centauri. I wish he would do a GDC postmortem for Alpha Centauri like he did for Civ 1.
His name in the game title is just a brand, the lead designer for SMAC (and Civ II) is Brian Reynolds.
However, is the whole "Back to the future" chapter basically about Alpha Centauri? Some time ago I read the book, but seems to be mentioned a bunch there: https://imgur.com/a/6d0U6oH