It's a general research-focused university, like MIT. The oldest research-based university in the USA in fact.
Though you're right it's very strong in medicine and all things 'bio' including biochemistry, biophysics, bioinformatics, and biotech.
But it also has a strong astrophysics program, eg the Space Telescope Science Institute is based there.
And the JHU Applied Physics Lab is not too far away too.
But I'm not sure why you feel that med-tech and bio-tech don't contribute to a tech hub. Are you considering tech as purely web tech?