I think he was just saying that Unity is overkill for simple projects and that was part of the impetus for creating VR Script so people wouldn't need an entire game engine to display some panoramic content.
If he meant what you said, he would have just said that.
Perhaps my ears are biased here, as I (as a programmer) have a great respect for "media people" due to their skills in content creation which I myself lack. "Content people" is the other term he uses here. What good is an engine without content? Different skills, not one greater than the other. I seriously doubt that John Carmack was attempting any sort of comparison here, subconsciously or not.
My take, as paraphrase: "It seems like using Unity is a lot of overhead for a panoramic VR slideshow. Here's another tool that you can try out and see if it meets your needs."
But obviously someone who has the technical knowledge to program video games (slight as that actually is...) IS in a completely different ballgame from someone who, say, is trying to get rich by streaming on Twitch or making a content farm on Youtube. I find that to be a valid usage of the phrase "media people."
As VR takes off, there will be a valid distinction between people who are using it more or less exclusively for purposes like content farming and marketing and people who are using it to build games or worlds of more depth than "look around this 3d photograph" or possibly "click the monkey." It's a valid distinction.