Interesting question. Thanks for the reply! I wasn't aware of this, but ChatGPT explained to me that mitochondria have their own DNA which is unique from the nuclear DNA that Dawkins was describing in "The Selfish Gene". After my tutorial from ChatGPT, I suppose that Dawkins would see the mitochondria as a second type of "survival machine" for a different set of genes, where the two survival machines are intertwined in a sort of a symbiotic relationship.