K-Rox shrugged, he had stopped being surprised by 21st century humans a long time ago, for every advancement they had, there was some backward law or tradition that cancelled it out.

I think this was possible because technological advancement is not like air, that is found all over the earth at the same time. It moves slowly from place to place. So despite the fact that all were in the 21st century, not everyone had access to development in the same pace or time. So it is very possible to have old ideas clashing with new thought.

If the game creators do not know that 21st century humans didn't eat that much and some places didn't have access to that much food even, then what else have they put in the game that is also incorrect?

I think Amorphia has hit on a possibility that these questions point to; the Great Confusion has not ended.