You absolutely can do that, you can literally write "write a song that sounds like X and is about Y" and it will generate multiple songs for you in under a minute for free that sound quite good.

I know how song generators work.

Song that sound good is not equal to song that you will like. Most songs written by people and AI sound good. Nobody need a song that sound bad. But very few songs you will like.

Also, he wrote text by himself, at least in songs I liked.