The article forgets to answer the question in the title, but the answer is simple. Pink noise has more bass, and the color pink has more lower frequency light.

The article forgets to answer the question in the title, but the answer is simple. Pink noise has more bass, and the color pink has more lower frequency light. Red noise has even more bass because red light is even lower frequency. Blue and violet noise have more treble, and those colors have more high frequency light.