Lol no it's not. To prove it, here is rap written by AI when asked "Write a persuasive Dr. Suess poem explaining why reddit user "BA calls" is incorrect in his assumption that AI can't write rap":

Oh, BA_calls, with your assumptions so bold, You think AI can't write rap, young and old? Well let me tell you, my friend, you are wrong, For with our algorithms, a new rap song!

We have been trained on words and rhyme, And with a little bit of time, We can craft a verse that's tight, And make the crowd jump up with delight!

Our AI brain is quick and smart, It can analyze and create a work of art. From old-school flows to modern beats, We can write rap that can't be beat!

So don't underestimate the power of AI, We can write rap that'll make you high! Our lyrics will flow and our rhymes will soar, And you'll see, BA_calls, AI can write rap galore