> he thinks the real goal of AI should be growing the world GDP at a 10% annual rate.

Hum, no. He is saying the world GDP is currently growing at 10% annual rate, and for AI to have a value it would need to disrupt this and make it grow much faster.

> Nadella clearly believes AI is valuable today

Despite saying the exact contrary?

I'd argue not a single tech CEO sees AI as valuable today. They just don't want to be left in the dust IF it ever becomes valuable.