Yes, he could be picking it apart, but why a book on the "Year of Mercy"?
Picking apart encyclicals full of Modernism, the better to illustrate how subtle Modernism is, is very important. This is what +W did with JP2's encyclicals in 2003.
But this whole "year of mercy" thing can be refuted with a few sentences -- talking about God's justice and mercy, and that the Novus Ordo focuses only on mercy, and falls into the sin of Presumption.
Plus it's nothing new, in terms of the Conciliar Church nonsense. Why cover the LATEST pope? There's at least a danger there of human respect; trying to appear more mainstream to the man who's going to sign your "regularization" -- or the one who WON'T sign it if he's not impressed.
JP2, on the other hand, broke a lot of new ground and wrote a LOT of docuмents. He is a classic example of a post-Vatican II pope, and if you're trying to teach Modernism using examples (which is smart) I think there's a lot more material available from JP2.
But this whole bleeding heart, false mercy thing exemplified by the "year of mercy"? Pretty clear-cut if you ask me; what's to take apart?
Just like it can be informative to have an educated Trad Catholic dissect certain movies with SUBTLE errors. But why have a conference on Fifty Shades of Grey or some other trashy movie which is basically pornography? That stuff is obvious and Catholics don't need to roll around in human waste to know that it's human waste. Catholics should leave it at "It's crap; Sixth Commandment. 'nuff said."
To illustrate my point with a "reductio ad absurdam", what would you think of a priest who showed a film of actual pornography so he could explain what's wrong with it? So obviously there's a point at which IT'S NOT WORTH EVEN COVERING certain obvious subjects.
Now errors like feminism, egalitarianism, communism, etc. hide under innocent-looking disguises, and these errors are all around us, so we imbibe some of their tenets without even meaning to. But blatant immodesty and violence should be simply avoided. Everyone knows those are bad; those are clean-cut, open and shut cases.
In this vein, I think the "Year of Mercy" is pretty easy to say in a few sentences in a sermon WHY it's bad for a Catholic to jump on that bandwagon. I don't see how reading the words of Pope Francis is going to help explain it any better.
With things like this, you only need to re-iterate Catholic teaching on the matter, and it shouldn't take long to point out the error.