I don't know the answer to this, but great whites are massive and definitely you could 'fit' a human in one just from a volume perspective. Whether you could fit into its mouth/throat, I don't know.
You also might not be thinking that clearly if you had just been swallowed alive by a baleen whale. That he was reasoning with any clarity at all, in his situation, is impressive to me.
Is a great white shark actually big enough that you could end up inside it’s mouth whole?