Don't they use solar panels for the receiver? How are they getting 20% if most panels themselves are roughly there? Are they using something cutting edge? Does it fall under the concentrated PV umbrella? But even those are only around 30-40%.
Hmm
As a very first guesstimate of the power efficiency from emitter and receiver I usually go for 30% X 30% which is only 9%, doubling the efficiency of one of them still isn't enough to get 20%.
They claim all the energy is in a very narrow IR beam, so it's well into the CPV density levels and needing very special PV cells, I don't think they've mentioned that!
They claim
100% link efficiency, but ~50% of the intensity would be lost just getting through the IR cover.
The figures/guesstimates don't add up, I think it's mostly fake, following in the wake of uBeen.