[whakim]

It's just not that simple. I'm not making a value judgment on the book (I haven't read it), but a person can say two things in the same sentence and the broader context can make it clear that they're just covering their ass, for example. Perhaps that's not what's going on here. Perhaps the book does constitute "malpractice." But...I think the situation is more complex than you're giving it credit for, and I wouldn't be comfortable drawing conclusions without a greater familiarity with the book and the responses to it. I also don't give a lot of credence to the blog you linked, since they use (as one of their two pieces of evidence) a critique which openly admits it hasn't actually read the thing that is being critiqued.

To your last point, plagiarism, for example, definitely counts as malpractice and humanities professors lose their jobs for it.