Had you understood the poem as follows ?
Fabiola wrote:Titus, our Caecilianus does not dine without the pig:
I would say "without a pig". Then everybody understands "a pig... as a meal."
Thus yes, pork meat is his favourite meal. ok.
Caecilianus considers him a charming dinner-guest!
I would say "So Caecilianus has got a charming dinner-guest". The meaning is now that this man is only worth dining with a pig as his guest. That's what they call "reframing". The pig's role has been "reframed" in a sarcastic way.
As usual, it is English that matters