But one of the most common strategies is to posture as if you have a good hand even though in reality you don't. That is deception.

By posture do you mean act verbally and physically? Or bet as if you had a good hand?

The first is mostly inconsequential in poker, you should avoid having tells in your posture and speak, but the goal is to avoid conveying information about your hand, not conveying false information about it to deceive.

The second is just the game itself, acting as if you had strong cards has a cost, and is not lying, when you bet you are not saying "I have a hand". In a sense you may bet with a bad hand, but you are more forcing your opponent to pay for a chance to win the pot on account of your hand potentially containing a strong hand. You are truthful in your representation of a potential strong card.

In fact if you were to bluff on a situation were you could not ever have held a strong hand, it would be a mistake, and you would stand to lose expected value.

The original claim is that people misconceive "that poker is about lying or that you need to lie to play poker"

The claim is not that deception can be used as a strategy at all. That btw is actually an uninteresting claim. In almost all games, you can lie to your opponent and probably gain some advantage.

If I were coaching a beginner poker player, I would honestly tell them to play statistically sound poker. That's a good way to make a lot of money.

Sure—but when you say it like that, suddenly it’s not a bad skill at all to tach your children, and teach them to be wary of others using it.