That's absolutely false. Firstly, while the advent of Jupyter notebooks have certainly made using Python better for data science, why would you think that would cause people using Python for unrelated purposes to stop using it for those purposes?

Practically, while data science / ML / etc work is a big part of Python, I'd wager a much larger part is still web development work (Django et all). And of course, just using it as a "scripting" language, or using it to create GUIs, etc.