From what I understand they take the 240 volts from your main line and the up the voltage to something like a thousand volts which goes to the wireless floor unit. I believe that decreases their losses by quite a lot and if you have really quality transformers and rectifiers and all of that then...
That's not how it works! Current chargers are only about 91% efficient so this can be more efficient than cheap home chargers just a little bit less efficient then really good expensive home chargers.
Nothing is 100% efficient not solar, not batteries, not converters, and not inverters. Not even...
Plexiglass, that would do it for sure especially if it was polycarbonate. That would be pretty epic and people would believe it and like everyone would try it on their truck especially influencers