npub1255fcs7q3s6mgzd3athuxqvm0693442yky2ezm96u6sk4ve7d9kqqr6apa (npub1255…6apa) Even that speech is slightly wrong, though certainly close enough to be plagiarism. Get it to duplicate some writing that is under current copyright and I'll be surprised. The probability is very low because copyrighted material isn't prevalent in the training data like public domain data is.
Also, regarding stable diffusion I have a different attitude, but that's mainly due to logos and iconic characters being so prevalent in the training. Copyright and trademarks are very different.