The fact that it’s mostly being pushed by UX people.

Is it? Personally, I've never even encountered it in that context, and I have attended several workshops on Design Thinking.

Sure. Let me then call it this way: "Design Thinking is the Data Science of design: an attempt to gain influence in fields that you don't have expertise in."

I’d retort that software developers aren’t domain experts either. At the end of the day you either luck out if domain experts and actual users are involved in eliminating toil (in the sense that Google defines that) and optimizing the user experience, while reducing friction in applications and providing insights into data.