Is this related to the outages from lets encrypt root cert expiring? Probably not since this looks like a DNS issue, but still it's a crazy coincidence that two major internet breaking events happen in the same week
There is zero reason to believe it's related at all. It's perfectly reasonable to have multiple large and unrelated failures in the same week.
I also wouldn't classify the loss of 1 company, and the expiration of some TLS certificates, as the interconnected network of networks being broken. The Internet has continued to function even if some larger players were unreachable or having issues.
