Measuring Zo is quite routine.
Making higher Zo than 377 Ohms is also quite routine
So the universe thinks he's got it wrong
Many years ago, RADCOM published an article on a 'toroidal antenna' with an academic prof's name on it. The ARRL asked me if it was a spoof article... It went out in an April edition. I said I had no inside knowledge, but just looking at it, choosing an inductor topology optimum for minimising leaked field must be the very antithesis of the intent of an antenna, so I reckoned it had to be a leg-pull.
It wasn't!
You have to be wary about stuff in magazines, even peer-reviewed ones. The occasional whoopsies do get through. 'scuse me, I have to get the cold fusion reactor going now, I need it to power my N-Ray generator.
David