I and some other fellow players have reported about this issue on steam community forums:

http://steamcommunity.com/app/289130/discussions/0/485623406955374047/

Why? How?

I was by far the first to achieve 100 approval.

And the funniest thing of all, Red isn't in era 4, he barely made it to 3!

I tried to replay that turn and activate as many boosters as I could. Got up to 220 approval. Nope. Red still wins for no reason. Even though my approval for the start of that turn was over 220!!

I was the first to hit 4th era, I was first to hit 100 approval worldwide. And for the maximum approval, I tried to replay that turn and activate as many boosters as I could. Got up to 220 approval. Nope. Red still wins for no reason. No way his shitty last city (he was losing a war to Vaulters) could be even close to my cultists wonder city with 220 approval. That's just mathematically impossible!

So, all this means that "Glorious Father" is broken. Red got it just because he was an AI and appeared to accidentally be at 100 approval when I hit 4th era. This hardly seems fair.