Human brain can do calculations in the back of their head without realizing it. Verbalizing does not mean it's all they thought about.

But it does mean they thought about at least as much as they verbalised.

	▲	regularfry 34 minutes ago \| parent [-]
		Slightly difficult to disentangle is that they might be using the verbalisation as a way to explore depth, rubber-duck style, in a way that they wouldn't over the board.