"Codology" is an interesting word, as anyone can see by going here:
Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
So they started talking about capital punishment and of course Bloom comes out with the why and the wherefore and all the codology of the business and the old dog smelling him all the time I'm told those jewies does have a sort of a queer odour coming off them for dogs about I don't know what all deterrent effect and so forth and so on.
Unfortunately my sources don't give a full etymology. It's possible the word originates from this occurrence and subsequently changed meaning, or that Joyce misused it, or that I, even now, misread it. Nevertheless I probably shouldn't use it in a way that doesn't conform to standard usage. So thanks for doing some of the research that I should have done.--I saw him before I met you, says I, sloping around by Pill lane and Greek street with his cod's eye counting up all the guts of the fish...So Bloom slopes in with his cod's eye on the dog and he asks Terry was Martin Cunningham there.