Why are you being so condescending in this thread and still missing the root of the point? The sun’s emission spectrum has more green in the visible band than the other colors. The emission spectrum you keep mentioning. By wavelength distribution, the sun would be “green”. But, because our eyes are terrible spectrometers with bad wavelength resolution but we still like to use crayon descriptions, all the red and green gets interpreted as a combined yellow. You made a snobby comment about how all your art students understand how paint (subtractive) color works, but are you aware how light (additive) color works? Like why an RGB light can make yellow with red and green? Because that’s what makes our yellow sun “green” by certain metrics.

So it stands to reason that if plants were predominantly green on Earth to reject and regulate green-wavelength energy from our sun, a red dwarf, which has more red output, could cause red plants to develop.

A red dwarf isn’t exactly red. Our sun isn’t exactly yellow. Our sun isn’t exactly green, either.