all professional tasks” being done by AI. Most tasks that involve “sitting down at a computer” will be fully automated by AI within the next year or 18 months,

So does that include working in AI? In 18 months we will have the AI program itself?

Quite the blanket statement, and as always with blanket statements, they are probably false.
Of course it could be true to a lesser degree, like maybe 20%, but "ALL" is ridiculous.