Thanks, I guess I was lazy.
So it looks like, officially, the only people who get wifi included with AC access are AC members and one-day pass holders.
While it's nice that AC members get wifi included in their membership (though this was not always the case), there's an incongruity where a passenger who pays a considerable premium for a bundle of services in J doesn't get something as simple as wifi access, while a passenger paying a much lower amount for AC membership has that included.
I understand the arguments that if you are willing to pay a $2-4k premium over Y for business class, a one-day T-Mobile pass (or an AC membership, for that matter) is a drop in the bucket. But a good part of the reason why one pays for premium services is not to feel like one is not being nickel and dimed, e.g. similar reasoning to why airlines don't charge for food and drink in F/J (yet) even though those flying there could probably afford it.