It’s not Twitch. Twitch doesn’t thottle IP’s they’ll flat block you and email you.
8.8.8.8 has had some issues this week. Completely went down.
In your example you have changed your routing.
This likely means you are bypassing a faulty node in the route between you and twitch.
But if you really think it’s Twitch, which it isn’t because they don’t IP throttle.
https://twitchdev.zendesk.com/hc/en-us is the direct line to Dev Support. And they;ll tell you the same thing.