All "tuxedo" refers to is a black and white colored cat. Usually because tuxedos are usually black and white. Your kitty is just a handsome bi colored... Not really fitting into the tuxedo category.
I know , that's like saying the breed is a tabby, not true its just the pattern that presents on the fur, I have no clue what his breed is nor do I care,breed does not mater its just fun to guess for me.
Also a Tuxedo is not a breed of cat either, Its the color markings of the fur, being most breeds(Persians,Ragdolls,Spinx,ext) can come up with this pattern.