Yes! All data is fetched via GitHub API (due to the massive amount of data and the API rate limit, data is not updated in real time).
HN user
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The only semi-manual section is https://opensource-heroes.com/awesome. All other data in the site is asynchronous updated via the GitHub API. But yeah, we still need to improve some UI stuff, specially in mobile (it looks quite good in desktop).
That's right, we have thought a few times that we should just skip repos with no language detected from rankings (and probably move this kind of resources to another section).
Btw, in the "Top Contributors" section, you can filter out contributors by languages, example: https://opensource-heroes.com/contributors?language=python
There is only one curated section, which is "Awesome" pages (https://opensource-heroes.com/awesome). The rest of the data of the whole site is pulled from GitHub API.
Thanks! You can also filter out contributors by language and/or country: https://opensource-heroes.com/contributors. And you can even explore stats for each country: https://opensource-heroes.com/countries. And much more! There is also "Reviews" (like Google or Truspilot, but for open source).