Of course it’s a way to try to claim the username.
Violating trademark is #1 under the policy, which I may explore. #3 may also be in violation but Twitch will have to determine if the account is in use.
Here’s my question again:
This question is ultimately about trying to figure out how to claim a potentially inactive account with my extension’s name.
It appears contacting Twitch’s email support will be the only way to determine if the account is inactive and capable of being claimed.