I think he was very clever, but generally when someone claims to not be something very loudly, it has been my experience he protesteth to much…
A law is a principle that applies to a given situation where such a violation of the law is not possible. Given that God has laws that he must conform to, he is good, he cannot do evil, etc… What is your concern re Incarnation and a God of Laws?
Conversations with calvinists etc in the past were fruitless. There typical response is that God is not bound by laws, he can do no evil because by definition anything he does is good, so if he were to arbitrarily choose to inflect a miraculous disease on a child that even in a utilitarian way creates no good, this act would be good. This is in my mind so irrational as to make any future conversation fruitless.
Generally, in religion it is frowned upon (to put it mildly) to suggest God has limits. That he cannot do anything he wants, but functions within his laws. There are, imo, practical considerations. God functions within these laws so perfectly that they are not limitations. He does not say, If I could only do this than I could accomplish that. It is my opinion God does not even consider an act other than inconsideration of His Laws. I do not think what we would term ‘limits’ or ‘constrained to laws’ God would consider in such a light.
There are obvious theological ramifications to worshiping a God who functions within Laws. One being as you pointed out a being that is limited by the same necessities of his existence as God would be a God. This may seem sacrilegious, but in a sense the savior is the same. In the triune God, each personality would be able to function and constrained only by the same necessities of His existence, and these would be the same for each person of the Godhead. Would this be heretical in RC doctrine?