Texzon (Viziv) ((Nupower)) is apparently at tradeshows, and
from this reviewer YT video it now looks like they've sold their system to Bahrain. Search trademarks, and it shows that "Viziv" was registered in March 2018.
How about a desktop demo? Do it at 440MHz, with little bitty 2cm resonant towers, perhaps connected to a giant metal sheet (such as the side of a warehouse? Aluminum boat? Quonset hut?) Anyone have access to a two-meter vandegraaff sphere? But here's a simpler 1-D version: hook the base of a tiny Tesla coil to a very long wire (many wavelengths,) then drive the coil at resonance using a coupling loop. Shouldn't all the fields say local, within 1/4 lambda? The 'zenneck' stuff is about waves that are supposedly launched by this system, and go zooming off down the long wire. If the wire is a resonant length, will large standing waves appear on it? (It shouldn't experience RF losses to radiation, since the e-field is perpendicular, so, unlike with longwire antennas, the wattage is only supposed to travel parallel to the wire.)