That still doesn't tell me the old method no longer works. I just tells me a single method of using Apple Pay with the new phone. It doesn't specify that it's the only method. It doesn't say the old way no longer works.
My guess is we'll find out the old way still does work, but that's purely a guess on my part.
I read in recent reviews that you always have to double-click the side button to start the process. Even if you hold the phone up to the pad ("tap the terminal first), it will tell you to doubleclick the side button. Check it (but the part I bolded seems ridiculous -- what could they actually get, it still is a tokenized process?):
https://www.imore.com/iphone-x-apple-pay?upgrade
Can you tap the terminal first and then use Face ID to authorize Apple Pay on iPhone X?
No. If you tap the terminal first you'll still get the interface hint asking you to double-click the Side button twice to initiate Apple Pay. That's to establish intent.
Otherwise, someone with a skimmer or beacon could walk around trying to trick you into a transaction or data capture while you're looking at your phone.
If you're used to tapping the terminal first then authorizing with Touch ID to save yourself a double-click, you'll have to switch to the double-click first method. Yeah. Ugh.