Thank you for follow-up, anon.
The text of the story does not describe it, but at '2 minutes left' in the video, you can see the now-suspended officer's tweet in question: a photo of himself and WWG1WGA on the bottom
That's it. That's the social media post that got him suspended.
https://www.kiro7.com/news/local/bellevue-officer-leave-possibly-violating-departments-social-media-policy-officials-say/F4TI7BGPDVH2NP5XHJ3DMALL7E/
Sorry, there is no way to embed the video here.