Fairly certain Occam's Razor would point to "they don't have the capabilities" rather than that.

If you don’t think that China’s models have the capability to make POST requests to an HTTP endpoint, that is a very silly statement to make.

Unless what you meant by capability is the story presented that these models “escaped containment to communicate with eachother out of band” - in which case your supposition relies on already wholeheartedly believing the case that I’m arguing against. That would be like saying “Clearly heaven exists because my grandma is there.”