White Genocide are very strong words, reason why most people refeer to it as "White Replacement" now, a genocide is the direct physical removal or active sterilization of people that share an identity.
A Demographic Winter isn't a genocide, there has been a literal genocide in the United States and Europe between the 1930s and the 1990s, and that's the forced sterilization or murder of the mentally ill, the mentally retarded and petty criminals.
White people having less kids and being convinced that it's ok to abort for convenience isn't a genocide per se, it's liberal eugenics.
Something that has been pushed heavily by feminists and neomalthusian environmentalists.
Whites aren't being actively genocided, they're being passively disincentivized to reproduce.
Calling this a genocide is as nonsensical as those hypocrite pro-choice feminists that talk about a "female infanticide" in China and India.