Not quite - the idea is that there's a difference between
correct play and
perfect play. Sometimes the two overlap, but you can't know that while you're in the hand.
There's an example in that Absolute hole card schomozzle that illustrates it - the whole "10-high on the river" thing.
If you've got nothing but 10 high and your opponent is betting into you on the river, unless you've got some amazing read the
correct play would almost always be to fold.
If you could see your opponent's hole cards though, and you could see that they only had 9-high, then the
perfect play would actually be raising. If they fold, you weren't getting any more money anyway, and if they try to
bluff you back, so much the better.
This is probably getting bogged down in semantics... point is, perfect play is a retrospective concept - by definition, unless you're cheating you can only find out what the perfect play was after the hand is finished. Finding the
correct play while you're in a hand should be what you're most concerned about.
Rainsoaked does make an interesting point though: even the perfect play won't win every time.