While I broadly agree with the author's characterization and summary of the importance of "real" soft skills, that seems to be a tiny slice of how the term is used. I've seen discussions of soft skills cover a ridiculously broad assortment of actual skills, cultural sensitivities, in-group identity behaviors, personality traits, and neurological aptitudes. Without being a lot clearer about the scope, I think there's…
Mostly soft skills represent your ability to react rationally and appropriately to your own emotions and to the emotions of others--even emotions that you're anticipating and not just experiencing. The most basic soft skill in my mind is empathy, which is your ability to anticipate how others will feel in a given situation. If you're not capable of empathy I do not want you as my manager.
A better set of characteristics to look for might be: sympathy, compassion, consideration, honesty.
‘Empathy’ as a term actually has a shaky and very recent etymology which reflects some of the contradictions it plays into. A loose translation of it’s origins is to express sympathy, which has a slight technical from what it means now, because it has been widely adopted as dignified form of sympathy. The difference from the classical term sympathy is that empathy is more correlated with communication than intention. Why has it gained in popularity? A socio-cultural argument might center on the fact that empathy carries less vulnerability than sympathy. There are some serious implications here.
The general problem with the focus on empathy is the loss of a bigger picture concern with being sincere. It’s analogous to short-term concerns vs. long-term concerns, where short-term concern is to provide immediate comfort and long-term concern is to provide sustainment and survival. A highly social workplace will value immediate social relations like expression of compassion while overlooking important long term values like honesty and less-empathetic forms of sympathy.
Ideally, we would maintain both, but these simplifications of the issue are unlikely to support that outcome.