She describes sex as only happening in infatuation romance. She redefines sexy to something non-sexual. She details laying in bed together and being alone together in a way that most people would call boring (playing a phone game).
And the word sexy is already popular in many non-explicitly-sexual contexts. Like "intelligence is sexy", "sexy car", "sexy clothes". I'm pretty sure I've described code solutions as sexy a number of times. But unless you're into mechaphilia sexy cars are not sexually attractive.
TL;DW: Just like sex doesn't have to be about penetration, foreplay isn't just about touching or dirty talk.
Intimacy is about sensuality and closeness. Those don't have to be anything to do with sex. For example, it's possible to experience intimacy in a completely non-sexual setting, such as a honest conversation about death. Intimacy is about the feeling of closeness to someone, not about what that closeness results in.
I think aside from skewed attitudes towards sexuality the problem with the concept of intimacy in particular is that the word is often used as a euphemism for sex -- "being intimate" usually refers to having (had) sexual intercourse.