I assume because it can obtain more solar radiation? It's not a difference in PV efficiency. Anyways even if I suck at science and am 100% wrong, we are still just arguing about something the company claimed they would do any then never even proved the concept much less commercialized it.
They still spend $10M to develop it, with only $1M of that going to R&D. About $2M going to pay for Nelsons salary and the rest to make guys like Greg Boden rich using absurdly toxic notes. Same way CABN, HYSR and BSRC do it.
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