I'm a little puzzled as to how focusing light from each lens onto a smaller area translates into making a panel smaller. It looks as though the area struck by sunlight stays the same - it's just the solar cells behind them that shrink. Do they, say, produce 1.5x the power per surface area through the day so they can be downsized and maintain output?

[EDIT] turns out it doesn’t make the panel area (the area exposed to the sun) smaller — but smaller individual cells can be made enough more efficient that with the additional photons from the lens it’s a win. And the lenses, originally intended to make the panel orientation less critical improve how they work on cloudy days. Also a win, particularly for places that are often cloudy (e.g. Germany). [/EDIT]