I still think it's correct. Execution is the part that matters.
Almost everyone I know "came up with" some startup, ex. Uber before Uber existed, yet none of them did it. I have personally thought of maybe 2 startup ideas that later came into existence.
Come to think of it, people in my circle that have ideas left and right are _still_ not founding companies even with modern LLM's that supposedly solved programming, clearly there is a disconnect somewhere.
Ideas are seeds. Seeds can be cheap or expensive, but perhaps what we want to talk about is not the _cost_ of ideas but the _value_ of ideas.
The correlation between cost and value can be very complicated, especially in the chaotic world (or chaotic situation).