Yes ! everything is possible theoretically.Why i mainly focused in theory is that a practical experiment has not been done in human.When it comes to experimenting directly in human being it is most difficult job. And considered unethical too ! So, a model experiment is done in a mice or a pig(for example).
But you missed the next sentence "it is practically possible but energy production is very less than demand."
Yes, it would have been better if i would have explained about mitochondria too. The topic would have then gone to very deep (to the molecular level).

After all, this is a fiction , a story of imagination ( just like avatar movie or antman). So, it depends upon reader whether a thing is non-sense or makes sense at all.

Thanks for the comment @cristi