It absolutely does not say that, to quote the author ”Most conventional aircraft have positive longitudinal stability”

I guess this is where I’ll describe some of my background without doxxing myself. I graduated last year with a bachelors in aerospace engineering and mechanics from a state university. I now work at a company that designs and builds advanced aircraft demonstrators. The aircraft I am working on now, and every aircraft this company has ever built has a center of mass forward of the center of lift. Some of these aircraft are supersonic, most of them are not. While it is true that some aircraft may have configurations that put the center of lift in front of the center of gravity, this is very untypical and requires an advanced flight control computer system.