IOW, that 24.6% absolutely does include the money they say they expect to owe when they eventually repatriate those earnings.
In the meantime, they earn returns on the money they've set aside that they "owe" for taxes they aren't actually paying, so deferring the payments is very profitable for them. They've even taken out large loans in the U.S. to pay dividends, because it was cheaper for them to borrow money and pay it back with interest than repatriate this money.
It's fair to say I love Apple, and I've been described as too ardent a defender of their, but they're being ridiculously disingenuous here, and it's clearly working, as you took that sentence from their statement at face value.
There is no law that requires US corporations to repatriate their profits; not choosing to do so means they're deferring a tax liability. What's disingenuous about that?
https://www.apple.com/newsroom/2017/11/the-facts-about-apple...
And the real rate is actually higher because it doesn't count the deferred taxes they owe and will pay when they repatriate.