Huh. Never expected to see this on EEVblog. I actually worked on this project about 6 years ago. But on the software side, not hardware. I never knew much about how the actual pill worked, and if I did I'd probably still be under NDA or something. I seem to vaguely recall hearing the term RFID being thrown around back then, but not sure if they literally meant the pill had an RFID tag in it, or if they were being metaphorical (or just wrong).
This was interesting stuff, but my understanding was that the manufacturer wanted to do this mostly to keep their branded Abilify in a monopoly position, as the original patents on the drug were about to expire. But apparently in the pharma world there's some tricky way to effectively "extend" a patent, which somehow has something to do with FDA approval (here in the USA anyway), where normally when a patent expires, that's just it, and anybody can step in and start using the tech as they see fit.
FWIW, the patch itself recorded the signals from the pill, as well as generic metrics like skin temperature, body position, heart rate, and a handful of other things. It paired with a phone using bluetooth (IIRC), and then the phone would stream the data up to a repository over IP. Then another process would push the data into a Hadoop cluster where analytics / BI stuff would run and process the data. The Hadoop cluster part is what I worked on, so I was a couple of "hops" away from the hardware.
Anyway, I probably can't say anything more than that, even if knew it. Still, it's interesting to see this come up. I'd mostly forgotten about it, although at the time I was originally working on it, the whole thing struck me as really cool and having a lot of potential.