That's because
> I can juggle
is here shorthand for
> I can juggle at all; I can juggle at least some things
and the basketball case is only a counterexample to the much stronger claim
> I can juggle anything
But the argument about AIs reasoning has little to do with such examples, because juggling is about the ability to complete the task alone. When it comes to reasoning there are questions about authenticity that don't have analogs I'm determine whether a person can juggle.