That's correct. Yes, I read the article :-)
You didn't. Mirroring in this case refers to using git --mirror.
You're assuming it works like a traditional file system or block level mirror, but it doesn't. Corruption would in most cases have been caught. The weak (and accidental) link was relying on the server to give us a proper accounting of the current valid repositories.
> You didn't. Mirroring in this case refers to using git --mirror.
We have established that he knows they used git --mirror, and I am pretty certain that you could not possibly know that he did not read the article.
> Mostly it's because they have decided that RAID 1 or RAID 5 should be a decent "backup" strategy, but then there are those who believe mirroring systems is how to do backups.
I think he is implying that this is a case of the second. That is to say, I think he is saying that --mirror is not a backup strategy.