The validation might need a couple of exceptions:

Algeria and Argentina don’t seem to have consensus if addr:province or addr:state should be used in address tags. Both countries’ name their subdivisions province (https://en.wikipedia.org/wiki/Provinces_of_Algeria , https://en.wikipedia.org/wiki/Provinces_of_Argentina).

Mexico has a state called Mexico https://en.wikipedia.org/wiki/State_of_Mexico