Github has recently changed the way their status page tracks uptime in the name of "transparency"[0]. "Partial Outages" are now only worth 30% of their duration, and "Degraded Performance" is worth none, so their uptime values are now wildly inflated.

[0] https://github.blog/news-insights/company-news/bringing-more...

Of course they hide behind corporate speak like "Bringing more transparency".