That's a quite persuasive argument.

One thing they acknowledge but glance over, is the autonomy of current systems. When given more open ended, long term tasks, LLMs seem to get stuck at some point and get more and more confused and stop making progress.

This last problem may be solved soon, or maybe there's something more fundamental missing that will take decades to solve. Who knows?

But it does seem like the main barrier to declaring current models "general" intelligence.