He has indeed.

But what he was writing about would be something like a method that
enables a medium power (tunable, not crystal-controlled) transmitter
that, while transmitting SSB, still allows reception of adjacent weak
signals from a receiver connected to a nearby separate antenna. At the
time of Wes's writing, it seemed clear to this reader that Wes believed
this technology didn't exist, at least in the amateur community. Since
his writing I haven't really seen the problem addressed beyond what I
mentioned in my first post, and I was asking if anyone knew anything
more.

Regards,
Glenn Dixon AC7ZN