Since Shank's comment didn't specify what they meant, I should have made a more charitable interpretation (i.e. assume it was "weak AGI").
I suspect AGI is quite possible, it just won't be what everyone thinks it will be.
Most humans cannot write as well and most lack the reasoning ability. Even the mistakes chargpt makes on mathematical reasoning is typical human behavior.
Human behavior is highly optimized to having a meat based shell it has to keep alive. The vast majority of our behaviors have little to nothing to do with our intelligence. Any non-organic intelligence is going to be highly divergent in its trajectory.