No, as the article tries to make clear, it is for handling of nuclear weapons-related information only. And yeah, people get it because they need to work in a lab or otherwise be proximate to the work, but aren't working directly on it themselves.
It is definitely not for handling nuclear weapons-related information only. It's as generic as a normal TS in that agency and is even given temporarily to people coming in from outside agencies with a TS/Poly for meetings.