

yes, you’re definitely right. the accuracy is dubious no matter what. in the author’s words, their approach is “semi-scientific” and “guesstimating”. not once do they say their results are definitive. but if it’s the best qualified demographers can do with what we know, then there’s not much else to it
collabora doesn’t provide a frontend and isn’t meant to be a standalone document editor. the “ok” is expected behavior and indicates the server is functional. you need a different service that supports collabora integration, such as nextcloud. then you just enter the address of your server and it should work