RxCy mapping is wrong?

I’m trying to set a single key to green. I do this by putting LEDControl.setCrgbAt(R1C8, CRGB(0, 160, 0)); in setup().

Per the RxCy coordinates in this thread, the space bar is R1C8. But when I use the code above, it’s the tab key that turns green instead. What gives?

EDIT: looks like the right thing is

LEDControl.setCrgbAt(KeyAddr(1,8), CRGB(0, 160, 0));
Where 1 and 8 are RxCy numbers.

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