> And what I am asking is precisely if there’s any reason other than that.

The author is explicit that that is the reason for which additional information is provided. So, the natural reading is from the perspective of the author in promoting the additional learning material, no, there is no other reason that is the focus of their promotion.

If you are looking for some more direct, specific, or immediate payoff, I’m sure there are lots of other things tailored to you.