I guess the modern day solution would be to use nitrogen rather than air to inflate. I gather that nitrogen is the current rage for hi ticket cars, presumably most major tire shops would offer that service.
Air is 78% nitrogen. Unless when they mount the tire and set the bead, they remove all air space and fill with nitrogen, you will have air in your wheel. I think they just like to up charge people. I don't see an advantage for N2 in your tire.