CHP are sworn officers in the largest State Police Force in the USA. These guys were "plain clothes", probably part of some special unit. And yes, that does seem odd. "Acting on behalf of the Capitol Police" just makes it worse. They were "sending a message" from the Feds, not investigating a crime.
I don’t care if the CHP’s were naked. This is from the CHP own website.
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The Purpose of the California Highway Patrol
The California Highway Patrol was created in 1929 to provide uniform traffic law enforcement throughout the state. Assuring the safe, convenient and efficient transportation of people and goods on our highway system is still our primary purpose.
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Do ya see anything there which indicates CHP investigates alleged on-line threats?