I accept there are productivity gains, but it's hard to take "10x" seriously. It's such a tired trope. Is no one humble enough to be a meager 2.5x engineer?
10x probably means “substantial gain”. There is no universal unit of gain.
However if the difference is between doing a project vs not doing is, then the gain is much more than 10x.
I don't know what to tell you, it's just true. I have done what was previously days of BI/SQL dredging and visualizing in 20 minutes. You can be shocked and skeptical but it doesn't make it not true.
There is no x is because LLM performance is non deterministic. You get slop out at varying degrees of quality and so your job shifts from writing to debugging.
Even 2.5x is absurd. If they said 1.5x I might believe them.