Even if it is not flat towable, it can be coasted in neutral with the engine off. You more or less agree that all automatic transmissions are technically "flat towable".
The disagreement starts on the amount of damage suffered by doing so. Here, I also completely agree that a regularly Engine Off Coasted (EOC'd) transmission will eat your bank account if the manufacturer absolutely forbids any flat towing whatsoever, no matter the speed or distance restriction.
In the case of Honda, it has sufficient cooling and lubrication if towed for 80 km, at 55 km/h. Arguably, the speed limit can be increased if the towing is for, say 2 km.
Now, this is an area that the transmission design engineers didn't (understandably) research; the best source for data remains the experience of those who took the risk and tested it in their daily driving. Here, I would again like to refer to numerous hypermilers from cleanmpg and ecomodder; they have uncountable HM'd miles on their cars; I have yet to see an informed hypermiler with transmission damage that can be traced to NICE-On or EOC. Those who didn't read the limits of their cars beforehand were not so lucky.
Your suggestion about flat towing a Honda in its limits, for a couple of months, has already been done to some extent; the prime example is Wayne Gerdes, who has EOC's his K24 Accord probably more than anyone on the planet. He has yet to see any transmission repair north of 150k miles. His is just one example of many.