I find it interesting how this story claims "yuri" is pure-hearted female-female love, but "lesbianism" is dirty, sexy female-female things. Most of the time, yuri is considered lesbianism, while shojo-ai is that pure girls love.
Honestly, I think it's all bs. Homosexual female love is yuri, it is shojo-ai, it is josei-ai, it's lesbianism, it's pure, it's smut, it's everything.