Since you understand Dr. Lejeune's apparent defense of poofing, I'm sure you can answer clearly and concisely and in your own words, 'When is the beginning?', without having to appeal to authority. If you WILL give a time, then I will show you why you are wrong.
Incidentally, would you like to cite expert sources for your assertion that there is no beginning for an individual's lifetime?
You want expert sources for the time continuum of nature? That's like asking for expert sources that massive objects on earth are heavy. All anyone has ever observed above quantum scales is a continuum. If you have evidence of something as unusual and counterintuitive as poofing, which defies all experience, then the impetus is on you to demonstrate it. Good luck.
BTW, I can't imagine ANY geneticist, let alone "one of the World's greatest" issuing proclaimations that rock the foundations of physics. But then some people will say anything, no matter how far out of their league. Take you, for instance.