The post is also focused on content marketing. Many already are in agreement sales and marketing tends to be more positive because, let's face it, most of them are still coming in cold with products which are meh at best and terrible at worst.
For the majority of people, toxic positivity is a far bigger issue by having things invade their life to the point of having to sell themselves or others as far more positive than necessary, for reasons that do not reflect empirical evidence. Some people noted mass media culture of farming likes and internet points. Job interviews, performances and such are another, where negativity in any way is so taboo individuals now have to learn how to navigate a minefield of "give us criticism but don't you dare give us criticism". Most will even dare scapegoat it under "it's unprofessional to be negative".
The world sucks in a lot of ways. Yes, we don't have to keep rubbing in how much it sucks. No, we don't need to decorate it ad nauseam at every corner. The last bit will eventually explode into a counterculture where everyone berates the overly positive status quo. It already has online, just waiting for counterculture to catch up to corporate.