Solar panels, sublevel required under toilets, multiple tanks, electrodes.. It will need to be simplified and miniaturized dramatically to be viable - but it seems possible.

It sounds like the solar panels are oversized, and mounting it on a motor is particularly gratuitous. They mentioned batteries, but I don't know why they would be necessary. Couldn't the waste be queued up until daylight to be processed?

However, it's clear they're simply proving the technology. The question is, can it be manufactured and packaged efficiently and compactly.