I read the benefits from the wiki page only but I said - to understand the advantage of UPSXML which is "delievery area surcharge" i should probably understand that term and its usuage in postal service from the UPS website.

well the dummy addresses are real from the point of view of street address, city, state, postcode, country. I don't see a reason why UPSXML or inturn UPS itself should not be able to validate them.