Seems to be a bit of a reach, IMO. "small clump of cells" is a strawman.
He says he doesn't have a clue when this happens and then he proceeds to tell us exactly when it doesn't happen.
I've often wondered of the atheist libertarians who mouth the words "unalienable rights," what are they thinking when those words roll through their brains? How can any clump of mere biological matter birthed by mindless, directionless, purposeless chaos claim to have ANY rights?
Viewed honestly from the cramped, unbreathing, dead perspective of the atheist libertarian, "unalienable rights" is a totally absurd and illogical concept.