And here I thought "astute" was a euphemism for "fart."
Doesn't look like answers are searchable directly. However, When a page full of questions shows up, the answers come along with it and are only revealed by a click. This will work, but it's tedious. ctl-a, ctl-c, open notebook, ctl-v into it, ctl-f astute. I didn't check to see if you can make superlong pages that would reduce the number of iterations required to cover the territory. Don't forget to search only "answered" question in the little combo box near the bottom. Maybe you have to be more than astute to get this done easily?
proof of concept accomplished: first page of QAs has three astutes in the answers. Of 388 answers given so far, they take 20 pages to display. Where's my python when I need it?