Yep, it's official.
SPEED is also re-hashing the story. Looks like it's end of the line for Kurt:
This guy really was an asshole, though. I certainly won't miss him, and I'm glad Jimmy Spencer punched him.
At Daytona in Feb. 2008, Tony Stewart and Busch were summoned to the NASCAR hauler after contact during practice for the Budweiser Shootout. During that meeting, Stewart allegedly punched Busch after Busch called Stewart fat and made remarks about Stewart’s haircut.