People who write these posts want to elevate their self value by nay-saying what is popular. I don't understand the psychology but it seems like that sort of pattern to me.
It takes a deliberate blindness to say that AI/LLMs are just some sort of thing that has popped up every few years and this is the same as them and it will fade away. Why would someone choose to be so blind and dismissive of something obviously fundamentally world changing? Again - it's the instinct to knock down the tall poppy and therefore prove that you have some sort of strength/value.