Air is a poor conductor for DC. AC is another story. Still not great, but shorter wavelengths conduct better.
Now, let’s also be careful. There’s a difference between transferring energy (like feeling the warmth of sunlight) and conducting electricity. There’s actually a strict result of electrodynamics that you “cannot” conduct electricity through electromagnetic radiation. Through the photoelectric effect you can cause a bound electron in a substance to become unbound. But that’s *not* conducting electricity. Which is part of the fast and loose pseudoscience of that whole article.
In the first video in the article I watched the guy who claimed he was lighting bulbs with electricity from his tree girdle that tree with a copper wire. I all bit guarantee that tree died. Total bs.
Oh - also more - water is a LOUSY conductor, contrary to yet another claim in the article. Dissolve ionic materials (like salt) into the water and it can conduct better - but even then it’s a lousy conductor.
Which is why the National Symphony Orchestra uses a person, specifically Gianandrea Noseda.