Earlier quoted context omitted.
Yes, though clunky. When I try the example: % host -t txt foo.wp.dg.cx it looks like the "foo" in the domain name gets converted to FOO, then goes to the Wikipedia entry for https://en.wikipedia.org/wiki/FOO which is redirected to https://en.wikipedia.org/wiki/Artillery_observer#British_For... , causing host to respond with text from the image caption: foo.wp.dg.cx descriptive text "thumb|240px|A U.S. Marine artiller…
While the serving code still works the code to download Wikipedia dumps and summarise them has bitrotted. The database is circa 2013, so you’re exploring a nearly 11 year old summary of Wikipedia!
It looks like FOO (all caps) redirected to Forward Observation Officer on July 2008, says https://en.wikipedia.org/w/index.php?title=FOO&action=histor... so there was a narrow window when your "foo" example worked as described, before you updated the dump to the then-new redirect.