This reminds of of the chess computers from 30 years ago. Experts were convinced computers would never beat GM humans, based on the state-of-the-art of the time. They never took into account all the future advancements in hardware and software.
The same thing happened for Go a couple decades later. And now it's happening for AI art. Enough computational power and a sufficiently well-trained neural network can indeed exceed anything a human can do.
AI has been roughly doubling in performance every year or two, for quite some time. We just never noticed when it went from 0.0001% to 0.0002% of human capability. This is the year that it doubles from 1% to 2%. And there's not a lot of doublings left until it shoots past 100%.
The super hard problem is driving a robotic body, vs rendering an animation of the above.