I'm not sure if this is intentionally obtuse, but yes "tech" as a slang term doesn't mean "technology", it describes a type of company largely known for the prowess and scale of their user-facing software. This includes such entities as Facebook, Google, Apple, Microsoft, Netflix, and Amazon, but is not inclusive of course.
Tesla, on the other hand, clearly produces technological artifacts - quite impressive ones, at that - but they are not a "tech" company within the colloquial context you've stumbled into
Tesla, on the other hand, clearly produces technological artifacts - quite impressive ones, at that - but they are not a "tech" company within the colloquial context you've stumbled into