This means, despite the blockage, there's sufficient light coming through the handkerchief to the solar cell, so that the solar cell is able to decode and stream that information, in this case, a high-definition video.
Ini artinya, walaupun ada halangan, ada cukup cahaya yang masuk melalui saputangan ke sel surya, sehingga sel surya dapat membaca sandi dan mengalirkan informasi, dalam hal ini, video resolusi tinggi.