It isn't, which is why I posted the video showing that.
On the screen you can very clearly see:
Room (1 Night): $180
Taxes & Fees: $32
Total: $221
The resort fee isn't included in any of those. They put it in fine print thats hidden below the Apple Pay button. But they designed the UI to make it so that the Payment button is flush with the bottom of the screen in order to hide the fact that the fine print is even there.In other words, they're purposely trying to hide the fact that the page is scrollable or that there is more content (the fine print) after the fold, and are trying to lead the buyer to believe that they already have the full pricing information before hitting the Pay button.
If the fine print that included the resort fee was above the Payment button then that would be one thing, but it's purposely designed so that you can't even see that the fine print even exists.