What an inane strawman argument. Houses are obviously not worthless because there's finite land to build on and building houses takes a non trivial amount of labor and capital. The problem the user you responded to is pointing out is that a lot of people assume productivity was the problem with so-called creative fields and these tools are going to somehow fix that problem. What's actually going to happen is a ton of people are going to produce a ton of trite AI content that is essentially identical because everyone is using the same models, thus inflating the supply. In addition, nobody actually gives a shit about AI generated garbage, so demand isn't suddenly going to rise. In many ways, the attention economy is already saturated, and the way you succeed there is not through productivity but by differentiating yourself in ways that make your content more desirable.

Put simply, have you heard of or do you follow any AI based creators? I can name 10 or 20 artists, content creators, movie directors, or writers that I respect pretty much instantly. Can't really do the same thing for people using AI.