Does anyone know of any other information that's politically sensitive to the Russian authorities that was posted on Github? It can't be just this on text on suicide methods, right?

Interesting development. Github was temporarily blocked in China in january because it was used to host politically sensitive information. However, it was later unblocked because the site's economic importance is too great to the Chinese government to warrant a complete block https://en.greatfire.org/blog/2013/jan/github-blocked-china-...

Since "gitlab.com" have no relation to "gas and oil" business, it has zero economic importance for russian government.