Once upon a time (years ago) the design of the Sites list in stackexchange.com was different. Very different, and it supported auto scrolling to a specific site by having its name as the URL hash parameter.
Proof for this: https://web.archive.org/web/20110810010204/http://stackexchange.com/sites?expand=true#physics (archive of the sites list from 2011)
Wait a bit, and you'll see how it scrolls down to physics site. (Health still didn't exist back then)
At some point, they changed the design and functionality, removing the ability to auto scroll to a specific site and instead using the hash parameter to let user sort the list by the various options, and SE team simply forgot to change the code in the beta sites "more stats" widget.