This does not solve any actual problems, so it is best to just wait until they fold, or deliver something we can look at without violating a confidentiality request letter.
I can't find the actual amount of transferred power. All test reports have very small numbers. Not anything useful for actual charging of high-power devices, like phones.
Ok, it looks like 2.4 GHz is used for communications and sub-GHz for power transfer with maximum transmitter power of 40.2 dBm (conducted). And FCC is only concerned with the radiated power, so who knows how efficient that this is.