You're right, I feel stupid now
. I just ran a search, and there has been already two threads on this, one from around a year and a half ago, and the more recent one in which you spoke of from almost nine months ago.
I apologize for getting anyone's hopes up if this thread excited you.
Here's the accurate chart from Sweetpeacurli's website on which silicones are truly water-soluble:
I'll admit, I too was discombobulated when you revealed that the mixture is only water-soluble in the bottle, but not on the hair. Like you, I didn't know what the hell that meant, until I began reading through that thread you spoke of, and I found this comment by Riot Crrl, which thorougly explained the chemistry and cleared my confusion on the matter: