I don't think that's too important, I mean the statement is pretty clear:
"..however, if your site has a geographic TLD/ccTLD (like .co.nz) then we will not use the location of the server as well."
The beauty of it is that there's no other way it could be done! It's not that Google could do what they wanted, even they have to adhere to basic logics too. A country-specific TLD is an exclusive signal by nature, there's no way other signals could override it or water it down:
we can't really "average" between New Zealand and the USA