Etc etc. That’s papers in Nature, The Lancet, The European Journal of Applied Mathematics etc. If you actually searched you would have found tons and tons of papers and citations. She clearly does “hardcore” research by any reasonable definition as you would expect given she has been for some time a professor at UCL which is a top-tier university.
There are examples like Stephen Hawking, and he did truly impressive work in hardcore science as far as I know, despite the challenges and obstacles that he had in life. Hannah Fry has done a lot of soft work, lots of books and other media, lots of activity, a very hardworking person, and very skilled at popularity work. But that does not change my impression that her focus is not really on hardcore science.
She is a properly impressive person who warrants no shade, but it never surprises me to see it.