How would this make you feel?
You enjoyed someone's demo, gave them feedback, they were thankful and it was an all around positive experience. You sincerely had a nice time.
But then you find out that their art was 80% AI or so, and they didn't disclose it at all.
Would you feel betrayed? Angry? Would it make your heart race knowing that you had been "tricked" into having a good time?
Or would you be alright with it? You had fun, after all, so no harm no foul.