Scale up the size as needed... but if you don't have smart devices on each end you have more issues than just the plug... you don't want people plugging wall sockets into wall sockets for obvious reasons.
USB-C is not genderless. The cable is physically different from the port on my laptop and phone. They're suggesting a connector where there isn't a difference between a "plug" and a "cable".
Strictly speaking I agree it doesn't meet the definition of the word, but it achieves the goal of "only one type of cable"* so I think it's close enough.
*Someone is going to point out "extension cables" here, I'm going to ignore them.
Scale up the size as needed... but if you don't have smart devices on each end you have more issues than just the plug... you don't want people plugging wall sockets into wall sockets for obvious reasons.