Most degreed engineers I know that work in electronics, are electrical engineers, and refer to themselves as electrical engineers or electrical and electronics engineers. Degreed electrical/electronics engineers would also be well aware of transmission line effects in cables, and most with any experience would be quite aware of bulk circuit effects which would occur in anything that is not symmetrical in nature. They could probably even come up with a few more reasons for directionality. I can’t help but question your "engineering" qualifications based on your statement.
A degreed and working engineer, work not consider the article you link to be an explanation or proof at all. They would just view it as marketing blurb.
Of course, a degreed electrical/electronics engineer with any experience would be able to quantify, at least to an order or two in magnitude, the effects of these directional properties of cables at audio frequencies, at which point they would conclude directional effects, which are a given in virtual anything not perfectly symmetrical that carries current, would not be remotely audible, and hence are not truly "directional" in an audio sense.
As an electronic engineer, I struggled years ago with the idea of wire being directional because it did not fit into any of the electrical models I had learned. It simply did not make sense to me that an alternating music signal should favor a direction in a conductor.
