The article falls into the trap of committing the same error in declaring the proposals to be wrong.
Since personhood isn't a scientific matter, it's no more right to try to use science to prove personhood doesn't begin at any particular point than it's right to do the opposite.
So it's not a "myth" to say personhood begins at point X. It's simply an opinion, not objective right but also not objectively wrong.
I suppose that doesn't make for a compelling headline, though.