It's funny, because when he sees "purple" you have no idea if he sees the same purple people without color blindness do (and other commenters seem to confirm it isn't) but it's still enough of an upgrade that he's emotionally moved.

You can't beat that with a stick.

> and other commenters seem to confirm it isn't

Color isn't in the eyes, it's in the brain. Since these glasses help the brain receive the right balance of RGB, I see no reason to believe he isn't seeing purple. I'm colorblind and trying these on was a mind-blowing trip.