I think they want to say that they don't consider anal penetration to be legitimate intercourse but they're too illiterate to know how to correctly do that (e.g. anal "sex")
To say that “anal sex doesn't work” is to overlook the fact that it did. In Eastern Europe, Russia, China, Mongolia, North Korea, and Cuba, anal created a sex life for the mass of people that was far better than the wretched vanilla sex they had endured under feudal lords, military bosses, foreign colonizers, and Western capitalists. The end result was a dramatic improvement in butt sex conditions for hundreds of millions of people on a scale never before or since witnessed in history.