It's similar to the process that transformers use when you ask them to do arithmetic without tools, I think. Some CoT tokens must be emitted up front for use as a computational substrate, but exactly what tokens they are isn't necessarily important or relevant to the final answer. And when that answer is returned, it may not be possible to tell what the actual reasoning process looked like behind the scenes.

It only makes sense that the same mechanism comes into play in strictly-verbal contexts.

Also, this is why "distillation attacks" are largely bullshit that Anthropic spreads for political purposes. Proper distillation requires access to the logits.