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Is it really an internet wide outage?

Only 2 of the points in the US are affected on https://www.whatsmydns.net/ for the domains we've got on Dyn - same for Twitter etc

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If it's under a denial-of-service it's possible that it may respond correctly part of the time.

Since many (all?) of Dyn's authoritative server IPs are anycast, attack traffic is probably not well distributed either. If you're routed to a server that's getting a lot of attack traffic, you're likely to have problems, but a server without much attack traffic will work fine.

"Widespread" might be a better term.

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