I haven't read this particular book. But from the reviews I get the gist. I have some personal experience in this. As a beginning meditation teacher, in several situations, public, corporate, and in prisons. I have found that there has been a great confusion about "mindfulness", which has lead to some bad outcomes. Some greed, some outright fraud, and general ignorance.
This is a real thing.
Many teachers have written about this.
I stoped teaching in public for this reason.
@corlin exactly. It also decreases compassion, for the practice becomes only about yourself.