Descartes in his Discourse on Method (1637) argued that he could have absolute and foundational certainty of his own existence via his famous “Cogito ergo sum,” “I think, therefore I am.” He later, in the Meditations on First Philosophy (1640), refined the argument. He decided that his existence was not a matter of therefore, that is of inference, at all. Instead, it was an immediate, indubitable realization. “I am, I exist, is necessarily true each time that I pronounce it, or that I mentally conceive it.”
A recent Netflix series is to the contrary.