Fortunately, this is another instance of Apple's demonstrated propensity to mess up their website information.
My SBTi S6 arrived with both sizes of the bonus sport band.
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Just five minutes ago.
Congrats!!!! If I missed it, my apologies. I trust you got the power brick?
I also ordered a 3-1 charger kit as well. Phone AirPods Pro and AW. Neat and tidy!