One can learn Photoshop (although probably not in a week), but knowing what the buttons do won't help them paint something like this:
https://www.artstation.com/artwork/OyeVVv
One still needs to understand anatomy, gesture, shading, color, and composition. One also needs patience; digital or not, this kind of work takes tens, sometimes hundreds of hours. One learns all this through the practice of drawing/painting from observation for several years, like every artist has done since the dawn of time. Same goes for digital sculpting, animating, lighting, effects, all that CG stuff.
These software replicate real-life tools; even if you know how they work, you still need to know what to do with them as an artist.
Generative AI doesn't replicate a tool, it replicates the artist themselves - in the coldest, most impersonal way - and makes the user a client.
It's empowering to some; I've seen a couple folks become "illustrators" by selling their AI-generated work to uninformed customers. But in time, customers will not only know better, they'll be saturated by the amount of artificially-generated content out there and its value will drop. And most people have no need to become clients or art patrons anyway; there are loads of artists out there taking commissions on the (relatively) cheap and the average person doesn't bat an eye.
Porn being one of the first things to blow up in a new medium is a pretty well-known human phenomenon at this point. The user in that Twitter screencap is grasping at straws. That kind of imagery has always been around, whether human-generated or not.
As for modern/abstract art being the reason for the push, eh, I doubt it. Generative AI boomed because it gave everyone the chance to play with a new toy and conjure up fun ideas. Investors also got excited which increased the urgency for tech companies to integrate it into all their products, whether necessary or not. I think its uses will become more specialized in time, thus requiring specialists to do the best work with it, i.e. people with art or storytelling skills.
