That is already telling. A registered lobbyist...
The two claims he makes:
1. PV modules are made of Cadmium
Cadmium cells make less than 1% of the market, and they are a failed, dying technology. CdTe cells were made in hopes of making cells cheaper by not using a "microchip grade" silicon, but the people behind the startup making them were completely wrong about economics of the process — the truth is completely the opposite. It is silicon cells' process commonality with the rest of semiconductor industry that makes them so cheap.
Hey, but thanks to those joke dudes called "venture capitalists" for spinning them up.
2. PV modules are made of Arsenic
No, only first generation of cells made in electronic fabs were made with Arsenic as N dopant.
No commercial process ever used it. PV cells are N doped with Phosphorus exactly for the reason that it is non-toxic, and because Phosphorus is simply better as a bulk dopant. It is much faster diffusing, and requires lower temperatures for dopant activation.