Good to see this SG get its own thread! Maybe a bit bold to slap 'France' and 'Demigod' on it already, as it might give people the feeling that these things can't be discussed anymore. What often happens in the beginning of an SG is that things are going too fast, without enough consultation with the team.
Nothing wrong with the chosen parameters, but it's probably best to not consider them as final yet. From a practical point of view it's still easy to change things at this moment. Like if there are a few people who find the difficulty level a bit high, you can still adjust that. You can even go inbetween Emperor and Demigod if you would so wish - probably even while keeping exactly the same start position.
Also there were a few players who expressed a wish for a variant; Goodsmell mentioned 5CC and Daeron mentioned passive. Both variants mean a fairly peaceful approach to the game. You shouldn't choose a strict variant, because there also were a few players who didn't want a variant, but you could maybe have suggested a mild variant that wouldn't change much to the default game - something like no declaration of war. Since the AI will make a lot of demands anyway and because there are tricks to make them declare it wouldn't have been all that different from a standard game, but still a reasonable compromise, perhaps. It's just an example, you know, I'm not saying you should have done exactly that.
Please don't take these remarks as criticism, they're not meant in a bad way.
What are the AI advantages at this level?
Well, they get a it more of everything they already get, but most importantly they get an extra settler. That alone is already a 100% boost over Emperor, and it means you'll almost certainly get out-expanded now. Expect a tough start on Pangaea with a central start position.
I'll probably let this SG pass me by, because there are enough players anyway.