https://downdetector.com/status/github/archive/2020/06, This verifies your data as well, but if you look at the data from Jan '20 to July '19(massive issues in july), there have been more outages. Keep in mind that the stats don't include small outages that last upwards of 2 mins or are region specific. My team and I have been encountering a lot of two min or less kind(usually fixes on a refresh 10 seconds latter). It gets annoying after a while. Its weird given that github hasn't adjusted to quarantine effect.
I think this implied that it never was down for him before when it was reported to be down. Which is exactly my experience, too. I've seen a lot of GH down posts here - it never was for me. Now it's the same.
https://hn.algolia.com/?q=github+down