It couldn’t be the soul. The experiment was done with just the sperm enzyme and not the actual sperm. Also, it sounds like nonviable embryos flash too. The article is correct.50% or so of embryos are totally nonviable, won’t even make it to the second trimester. I don’t think those have souls.
No idea. Perhaps those souls need a few partial pregnancy 'training wheels' to learn how to run a body?