Under your broader definition of color, we've already found the three or seven or I guess nine if you want to count black/white, existing colors
Which is the point of the meme and I agree with it
all we can creatively accomplish is proving we've exhausted the range of available colors.
There is a lot we can do creatively besides creating new colors from stretch. The meme is about how the human mind is creative but this one thing it can't do.
Besides, how is your method creative? You said yourself it's pure mathematics.
I think you're conflating creativity and imagination. The task isn't about physically creating a color but about imaging it. About a mental image of a color you never saw before. Not about actualizing that color.
You made it into a counting problem so I really don't see your point here
Exactly. It's even impossible to imagine. We can imagine shapes and form and stuff we never saw and will never see but for colors, this isn't true. That's the whole point.