I decided I'd give this another shot, with a flowchart! See if this helps. Again, it's very difficult to decipher the arguments, but here goes:
A. Frylock's copying of WoTC's stat blocks and associated text isn't copyright infringement because WoTC can't copyright the stat blocks and associated text.
This is a difficult argument to make, and this is his "Monster stats are just facts, man" argument.
B. But if Frylock is wrong, and he is violating WoTC's copyrights (as he calls it, a just a mere technical infringement ... ahem), then he still is in the clear because he has an "affirmative defense" of copyright misuse.
This is where we get into Frylock's list of grievances, because copyright misuse is an equitable defense; it is the copyright equivalent of "unclean hands," essentially stating that even though there is copyright infringement, the court will not hold you liable because of the bad action of the copyright holder.
C. Specifically, Frylock is asserting that because the OGL is invalid as it protects no copyrights, or because it is valid in that it protects copyrights, and because WoTC is requesting that those who enter into the OGL not use material that Frylock is saying is not protected by copyright, this is "copyright misuse" as a matter of law and WoTC cannot enforce any of its copyrights against Frylock.
This is the part where he completely loses me; it is well-known that companies have used versions of the OGL in the past to compete with WoTC (ahem, Pathfinder), it is well known that companies can make, and profit from 5e products using the OGL (Adventures in Middle Earth), and it is well known that companies can make 5e products without using the OGL as well, if they want to chance it! So the specter of bad faith and anti-competitiveness that animates the copyright misuse defense isn't present; in fact, I am unfamiliar with any case that has ever come close to this fact pattern, and court routinely uphold much more restrictive licensing schemes. IMO.
So, is this a little clearer?