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They're boolean (single bit of information) but not boolean (single bit interpreted as meaning true or false). The LED isn't true or false, the microcontroller pin isn't true or false.

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This is semantic pedantry. The association true/1/high and false/0/low is well-known and understood.

Plenty of signals are asserted (true) by being brought low, or have 1=low (e.g. CAN).

huh? The LED isn't true or false, but whether the LED is on is true or false.

And whether the LED is off is false or true.

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