The entire comment is unmitigated bullshit. Think about it; it uses the years 1654-85 as a representative sample of European immigrants to North America, but that's absurd because we know for a fact that mass immigration from Europe didn't really start until the 19th century so it can't be even remotely true that most white Americans are descendants of the immigrants they use in their sample. It's shoddy and intellectually dishonest scholarship that's obviously and almost comically pushing an agenda. As such it doesn't deserve to be taken seriously.