Here is the link to the original scientific article.
http://www.cell.com/ajhg/fulltext/S0002-9297(17)30276-8
“Uncertainties also surround the fate of the Canaanites: the Bible reports the destruction of the Canaanite cities and the annihilation of its people; if true, the Canaanites could not have directly contributed genetically to present-day populations.”
No reference was provided for the assertion.
By contrast, very ancient rabbinic literature uses the term “eved kena’ani” (Canaanite slave), and explains special laws concerning them, including the provision that they be part of the Jewish community.