Why do solvers bluff?

What is said

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1. 0:00Nine-high. Every draw missed. And the solver shoves sixty-eight big blinds into sixty-four. Every single time.
2. 0:08Meet the player who never bluffs. Whenever he bets, everyone folds. He never gets paid.
3. 0:13Bluffs are what get your value bets called. Bet the pot, and you want one bluff for every two value hands.
4. 0:19The best bluffs are hands that can't win at showdown anyway. Like nine-high.
5. 0:24This all-in needs about fifty-two percent folds. It gets sixty.
6. 0:28Bluffing isn't gambling. It's how your good hands get paid.