How are these people not selected against at an early age? Maybe we can convince them that interstate traffic is actually a hologram and they should go have fun watching the trucks pass through them harmlessly?
The problem is that he is partially correct in that idea as many experiments in physics point to the idea that the universe we know shares many properties that a hologram would. Matter itself is mostly empty space with a small array of energy partials forming a framework and generating a forcefield giving it a defined shape.
There is a small, growing idea that our universe is made up of effect, and actually does not contain causality. In essence, all we see is the effect and that the cause of it happens outside our sensory bounds, thus the universe as we know it is more of a projection, or a shadow of the real universe, a hologram in no defined terms.
What's great about all the websites that talk about evidence for the Data's Holodeck Gone Wrong model is that the word "experiment" is never near the word "evidence" and the word "physicist" is never shown without the word "theoretical" in front of it.
So, at best, it's physics fanfiction, like strings, the multiverse, dimensions in time, and having an honest to god actual season of Doctor Who again instead of six episodes with half written poorly.
Basically, the only differences between the holographic moon theory and the holograpghic universe theory is that the holomoonie actually looks at the universe we really live in, but doesn't have the math to make the crazy look sane to people who can't do the math.