It uses a multichannel ambient light sensor, which is not a camera. https://www.ifixit.com/News/54122/macbook-pro-2021-teardown

Please quote the text you are referring to. I was unable to find any reference to. “multichannel light sensor” or anything that supports your above assertion. I would also point out a camera is in fact a “multichannel light sensor”.

From https://support.apple.com/en-us/HT208909:

The True Tone technology in Mac computers, Studio Display, and Apple Pro Display XDR uses advanced multichannel sensors to adjust the color and intensity of your display and Touch Bar to match the ambient light so that images appear more natural.

Find reveals 0 matches for the word “channel” on that page.

That’s because the word is “multichannel”. Safari on iOS, at least, doesn’t find “channel”. Not sure about other browsers.

Because Safari is shit. Real browsers find it fine.

True and that’s weird.

Nope, it uses the light sensor.