It has been said that authors who write in order to give pleasure cannot impart to their readers the truth of their subject matter  That claim cannot be true  If it were, one could determine the truthfulness of a book simply by looking at its sales figures
If the book were very popular, one could reasonably conclude that it gave people pleasure and ttherefore that at least some of what is written in the book is not true
A book can be popular for reasons other than its ability to give readers pleasure.