According to Scene Daily:
Suspended Crew Chiefs banned from the track: NASCAR has changed its policy and will not allow crew chiefs to attend races while they are suspended, NASCAR Vice President Jim Hunter said Thursday at Daytona International Speedway. Previously, the policy was to simply suspend a NASCAR license, meaning crew chiefs and others under suspension could not enter a track's garage area or pit road.
The suspensions were never intended to allow the crew chiefs to continue to work on the cars. Enough outrage about this was made in the media and online that NASCAR realized what was going on. About time.