That's the basic idea, yes. The link in the caption [https://images-na.ssl-images-amazon.com/images/I/61llDf3WTvL...] is unusually helpful, showing each port using four connectors of the uplink. So: 100mbps max, and you'll just get garbage on the other end unless you're careful.
It's an ugly hack, but hey, there's a lot uglier in active use.
It's an ugly hack, but hey, there's a lot uglier in active use.