Where's the line between speaking something into existence and telling a lie?

Both look identical. A person describes a state of affairs that isn't yet true. The founder pitching a new world order to the first investor. The novelist describing a book she hasn't written. The young man describing the career he intends to a woman he wants to impress. Verbiage asserting a reality not yet arrived.

The difference is not linguistic or intention, it is action and perception. Investor perceives that the founder then builds the thing: founder spoke into existence. Investor doesn't: founder lied.

Same words, same conviction, same audience. The only variables are whether the speaker then acts in accordance what the listener perceived the speaker committed to do.