If you want something like this today, there are widely available moca devices[0]. I use two pairs in my house and reliably get 1gbit on each run.
0. https://www.amazon.com/Hitron-Ethernet-existing-Backbone-Str...
0. https://www.amazon.com/Hitron-Ethernet-existing-Backbone-Str...
It's not at all like HomePNA in that it does not shit all over the RF spectrum. Please do not use these powerline bridges; they are awful in all respects and should never have been allowed to be marketed.
Also, doing the thing in the article isn't ideal either, though there are always a lot of interesting RF things to try with WiFi. Look into leaky feeders / leaky coax for instance.