How would they be able to claim so much land for such little token?
It's only depends on coin supply.
If there 2 coins at all 0.0001 coin can represent some square centimetre, probably one non divisible token can represent one non divisible unit of land
Who gets which piece of land if they where to redeem? Would it be on a first come first serve type basis?
I don't think so. It's probably better "from top left to bottom right on the map", or "from road to river" so last one get better land.
sub dividing land legally costs a substantial amount of money as far as I am aware
It can be more problematic, since foreigners supposed to have fair shot too, so I think long term rent can be an option, let;s say 50 years rent for token redeem.
The fun starts than some youtuber with his 0.075 coins get to the land and claim his 75 square centimeters and put his folding chair on the land, fun ends and token became a scam than some dude can't more redeem a token. Can be a good way to rent a land for much better price than neighbours and to make first physically backed asset for speculations in crypto space.