True back button auto-focus on X-T1?

Is this just not possible?

I see in this video: https://youtu.be/gb5r1​zoQaxo?t=7m29s the photographer has an X-T2 which evidently the menus and options are slightly different on. He shows how he gets back button autofocus (using the AF-L button) but I don't seem to have that menu option.

This article http://www.thewanderin​glensman.com …focus-with-fuji-x-t1.html seems to explain how to set it up, but in following the instructions what he outlines doesn't seem to work exactly like using the shutter button to autofocus. It seems that the back button focusing works with this method, but it's slower than having the camera in "s" mode and using the shutter button. Maybe it's just in my head, but the focus seems to snap into focus faster with the shutter button when compared to using the AF-L button like the article outlines.

EDIT: actually, after further testing on that second link, if I leave instant autofocus setting to AF-S rather than AF-C that actually seems to give me back button autofocus that's fast and how I'd expect. So I'm not exactly sure what I gain (or lose) by setting that instant autofocus to AF-C?

Choose how the camera focuses when the AEL/AFL button is pressed in manual focus mode.

AF-S: The camera focuses when the button is pressed (single AF).

AF-C: The camera focuses continuously while the button is pressed (continuous AF).

Because it's like that, and that's the way it is...

The AF might seems slow in AF-C because it is always focusing, once you push the shutter button it should snap.

Two Hot Shoes wrote in post #18597752
Choose how the camera focuses when the AEL/AFL button is pressed in manual focus mode.

AF-S: The camera focuses when the button is pressed (single AF).

AF-C: The camera focuses continuously while the button is pressed (continuous AF).

Because it's like that, and that's the way it is...

The AF might seems slow in AF-C because it is always focusing, once you push the shutter button it should snap.

Ah, makes sense I think. So that's just in manual mode, correct?

deronsizemore wrote in post #18598935
Ah, makes sense I think. So that's just in manual mode, correct?

No you can do it in single mode too. In fact if you half press the shutter button [or press the AF-L button] in single mode to focus you can then twist to focus all you want after that.