It was two months ago, and the prediction was 90% of code written by AI in 3-6 months, and ~100% in 12 months. Maybe he will be right but in a cursed monkey's paw sense where the amount of high quality code stays about the same, but that becomes a rounding error compared to the amount of barely functional spaghetti code being churned out by agents.
Similarly ~100% of written word will probably be penned by LLMs soon if not already, but that doesn't necessarily mean the writing is any good, only that LLMs can type really fast for pico-pennies on the dollar.
It’s more about the qty of minutes/hours AI can crunch information for you, reducing the context switching or loss of context. A lot of the back and forth will go away, replaced with prompt and planning skills needing to be more specific, for long complex runs as needed, then clean up short runs based on UAT and QA inspection after.