Productivity here is not just speed. It’s cost to get the speed.

If a manufacturer can spend a trillion dollars and get 100000% faster throughout, their consumption model may not fit that need.

Just because marketing can go 1000% faster doesn’t mean the business is 1000% more profitable given the costs

Here's the productivity gains: https://marketoonist.com/2023/03/ai-written-ai-read.html

From the article (And OPs title)

“there are still no signs of AI boosting productivity growth.”