retrofitting existing data to sound like it’s creating something new.

What the difference? That is basically how new human ideas are formed. Did you think you add completely new ideas everytime you transform your previous knowledge?

But since you're so confident in your claims, I'm sure it should be easy to prove the following ChatGPT output is not new and can be easily traced back to its training data:

Prompt: Create a short poem about a cow juggling bowling balls on a boat

Output: In a boat on gentle waves it sways, A cow, not grazing in greenish bays. Hooves deftly juggle, balls in flight, Bowling orbs, a whimsical sight.

Bovine artist, on the sea's embrace, Balancing spheres with tranquil grace. Ocean breeze, a playful gale, A cow's performance, a quirky tale.