No, I said it 'won't' (given his symptons) because you said it 'will' if it's headgasket failure. Clearly back then, you didn't know about the different ways of failures.
You've just showed that lack of knowledge again (no offence), by saying 'but if the cyl ring bit of cylinder hasn't gone (allowing water to fill the cylinder) which it hasn't because it runs fine'
Firstly, it's not running fine. Secondly, if there's a headgasket cause of coolant loss, then the 'cylinder ring' or 'piston ring' will have nothing to do with coolant and oil mixing or any type of coolant loss.
The gasket may have blown between a cylinder and coolant channel, which will let coolant pass into the cylinder. The engine will 'burn off' this coolant instantly, not allowing any to mix with oil. Symptoms are of course coolant loss and usually overheating.