It's just a typical response. What he means (in an admittedly unnecessary, snarky way) is that this is not going to revolutionise perceptual colour science. It's not going to be an out-of-this-world experience, nor will it change our understanding of how humans perceive colour. I personally think it's pretty cool, though.

Agreed; that and the fact that it can be programmatic is either the major result or one of two. The title of the paper is,

Novel color via stimulation of individual photoreceptors at population scale

And they say, These results are proof-of-principle for programmable control over individual photoreceptors at population scale.