re: Is this using the circled template add on below?
Yes, that site is using the Circled template, however, they have customized it quite a bit.
The demo page is representative of what it looks like unmodified.
re: If so, can this also display birthday and anniversary dates?
The dates, anniversary and birthday, will be shown on the profile page not on the results page.
re: Also, is it possible to import a list of staff members with this add on?
No, the template does not support importing. However,the CSV Import addon is available and is used to do bulk imports.
I hope that answers your questions thoroughly!