They said it here:

https://news.ycombinator.com/item?id=44704593

But when you responded, am I bound by their context or yours? For clarity, I am responding to you both in a good faith steelman manner, so please respond in kind.

I thought the ambiguity remained, because different people have different opinions about network isolation, what it entails, how it may be implemented securely, and how different implementations have different implications regarding failure to maintain isolation in the event of a security breach that compromises networking equipment. Most folks aren’t running diodes at home. If your isolation relies upon configuration of reconfigurable equipment and/or VLANs, that isn’t isolated to readings that require or imply a highly secure computing environment.

https://en.wikipedia.org/wiki/Unidirectional_network