Actually it IS that simple, read 114. You CANNOT write INSURANCE to cover preexisting conditions, you may call it insurance but it is not. You may call a turtle an eagle if you wish but you can never make him flap his wings and fly.
You can make that semantic argument if you like but all it means is that we haven't had health insurance in the country since at least 1974 when they passed ERISA.
Since then employer group plans have had to take all comers, even those with pre-existing conditions, even though some plans had short waiting periods.
It's true that private market plans used to be able to exclude those people but that's always been a small minority of the population.
In fact, even if the ACA is struck down the majority of people won't be subject to pre-existing condition restrictions since they get their insurance through their employer who is subject to ERISA.
Anyway, I'm not sure what making that point buys you since 99% of the populace is going to think that we do have health insurance in the country - even if they're wrong by your definition.