Partially, but it's also because 90% of your work in "data science" isn't direct analysis.

You need to get the data from somewhere. Do you need to scrape that because Python is okay at scraping? Oh, after its scraped, we looked at it and it's in ObtuseBinaryFormat0.0.LOL.Beta and, what do you know, somebody wrote a converter for that for Python. And we need to clean all the broken entries out of that and Python is decent at that. etc.

The trick is that while Python may or may not be anybody's first choice for a particular task, Python is an okay second or third choice for most tasks.

So, you can learn Python. Or you learn <best language> and <something else>. And if <something else> is Python, was <best language> sufficiently better than Python to be worth spending the time learning?