I cannot specifically describe how he does it, nor how the current versions of CC do it.

There may be others out there that also by-pass. My guess is that a system of relays or switches open the circuits to and from the inverters when there is shore or generator power automatically doing what I am going to do manually.

A by-pass is not anything sophisticated or expensive relative to the cost of a coach. I just think that the designers did not necessarily think about failure modes when the coaches were designed. As people became aware of the issue some converters responded by creating systems to accomplish a by-pass.