Sorry missed this question, I will see if I can track it down again. There is a MSX history book currently being assembled and think the main person in charge of that has a proper copy of the interview with Harry Fox that has mention of their interaction with Coleco.
Do you have said interview so I can check the context of it? This is something I'm interested in more generally even if I don't think the hardware designer can answer the question. A friend of mine has talked to, and plans to again, Arnold Greenberg so it would be good to get some context on that front.