Right, the racist part is equivocating between "demographic change" and "extinction event" and thinking in terms of hypotheticals and extrapolations that aren't supported by data.

And there's all kinds of value prejudging that is entirely external to the data about what cultural change means, what it implies, what effects it will have, all of which involve disputable and extremely politicized assumptions that are trying to borrow from the objectivity of population data for rhetorical momentum in favor of specific preferences of racial composition.