It sounds like they are making a clear argument: models are getting worse for certain domains even while they are getting better at others.
I don't know if I agree with that but it doesn't seem like an irrational claim and does seem credible to me.
I just don’t think it’s true, or is significant enough to matter to the direction of travel of AI even if there were something to it. It’s another cope post being lobbed at the idea of AI going somewhere and I’m sick of them.