I'm with Jin on this for the whole damn arc. "What the Hell is this?"
It already started to get weird when it introduced extinct species that somehow came back,, but then you realize that Tyrano-sensei is somehow 60,00,000+ years old and somehow survived extinction (despite humans apparently being dominant enough to make several species go extinct), and now we have fictional animals that know they're fictional but somehow still exist.
I think the author is taking some pretty beefy drugs when he writes this. It's gotta be a mass hallucination of some kind.