I looked into that article and the guy who wrote it. The quote you're quoting comes from a book he wrote himself (although the quote is from a chapter written by some other guy.)
Unfortunately I couldn't find an online reference however, so it's impossible to know just how the measurements "Dr Van Voorheis" mentions were made. So far I've had a hard time to find any examples of people who have actually reproduced the large scale effects that Tesla claimed to achieve.
If you look for the author of the article (Thomas F. Valone) you find some YouTube clips where he's presenting a talk about UFO power sources. And he seems to be part of a MUFON which is apparently a group of UFO hunter enthusiasts. Now there's nothing really wrong with that, but it does mean that I'm not likely to take his claims at face value. And even he doesn't claim that the Tesla stuff is real, he only quotes other people (mostly Tesla himself).
Meanwhile you have an article at IEEE (http://spectrum.ieee.org/green-tech/mass-transit/a-critical-look-at-wireless-power/0) which seems to support the common understanding of wireless transmission of power. Basically that you can transmit power on roughly the same distance as the diameter of your coils. So a "charging pad" works, but powering a ship on the other side of the Earth doesn't.
To summarize I have to say that I'm quite convinced that if Telsas "World Wireless System" would have worked the results would have been reproduced today. The economic benefits are way to large for it not to. I'm sure the military would have loved to have remote powered drones and stuff like that if it was possible.