One thing you should realize is that what we're discussing isn't a bottled-performace product like, say, Octane booster is. This is a cleaning agent, which is designed to dissolve and clear out the crap you've accumulated in your few hundred thousand miles. I looked at one of the bottles the other night when I was getting some power steering fluid, and while I didn't see any kind of guarantee that matches what you're asking about, keep in mind that the chemicals in question are (though perhaps not in one's intake manifold) intended to run through your internals and they're not doing anything they weren't meant to.
The most damage I can see coming out of this situation is either running your internals dry, since this stuff probably washed a lot of oil from your seals and whatnot. I don't think it can do much of anything directly.