/r9k/ posting "YOU JUST KNOW" under any image with a white woman and any animal in the same frame doesn't make CF right or mainstream.
Perhaps not "mainstream" exactly, but the dog pill is definitely a meme now, outside of insular right wing internet communities. People joke about it regularly. CF's point was never that it was a common practice among white women, just that it has happened and that says something about the white race's spiritual health.
He played it up a bit to trigger basic bitch alt right guys who put white women on a pedestal, who think whites bear no responsibility for their own civilizational decline and will accept any degeneracy as long as the person doing it is pro-white.