Eco says: if I weren't afraid of sounding pretentious - I would say that ...
and then immediatiely saying it. So impressive how quickly he masters his supposed fears.

the dispute between internal realism and external realism would tend to compose itself in a notion of contractural realism.
a dualism between cognitive communication and biological communication,
the unconscious substrate of biological imperitive

It's clear as mud, but it covers the ground.
I'm afraid I'm not quite equal to the intellectual pressure of the conversation.