Yeah, but we live in the physical world where there are actually finite number of positions that the strap could attach. "Infinite" is just marketing speak here.
http://www.apple.com/watch/apple-watch/
It is, by definition, infinitely adjustable, since the band is sized continuously and attached magnetically (so that any part of the band works as a sizing point). It does not have discrete holes, like most watch bands.
http://en.wikipedia.org/wiki/Planck_length
Of course, that's being super pedantic, because 10^31 is practically infinite, or at least more than you'll have time to try in your lifetime.