Well, one turn isn't really that much, and the AI needs all the advantages they can get!
The sorts of issues you need to consider are which squares will actually be productive in the early part of the game. Settling in this area will mean that with no access to fresh water, we will need an aquaduct to grow past size 6. This isn't a problem in itself, but its good to recognise it when we consider city placement => we will use no more than 6 of the squares surrounding the capital in the early part of the game! As it stands, these will be the three forest/game squares, the two bonus grassland squares and one other. I think this is actually a prett-good starting position.
The initial squares that will be worked are the forest-game ones. These are better than the bonus grassland, as they will give us two food and two shields. If we work the one that the worker is on, we can add a road and increment our gold (probably worthwhile, although comparable to the bonus grassland with mining / road).
If we settle on the starting square, the forest under it will be removed. The city center will produce the same food / shields / gold regardless of whether we are on the current square, the bonus grassland or even the plains. In the long-term, moving the settler north-east one sqaure might be an advantage. We still retain the game and two BGs in the (extended) city radius, but we gain a forested grassland in place of a plains square. To the far north, we gain a hill tile, which will be useful in the middle ages / industrial ages (we probably won't bother improving it until then). We also get more forests up-north at the expense of some coast. This forested grassland gives us another one-off 10-shield pop, and then the grassland underneath is probably slightly better than plains. We may even retain the forests to promote shield production.
The only downsides are the one turn wasted to move there, and the fact that we are moving from the coast (and hence removing the chance of building the colossus and the great lighthouse). Given that the map is pangaea, I don't think the Great Lighthouse is a must-have. Even if there is a second continent, we
should have enough room on this one to keep us occupied until we get to navigation! As for the colossus, it might be useful, but not indespensible. Considering that Beijing will be mainly used for settlers, we can always locate another coastal city for building it anyway.