As per a previous post, the old TrafficMaster RDS-TMC is no more as of April 2023.
TrafficMaster turned it off, nothing to do with Garmin or any car manufacturers.
This puts the old Garmin built-in units into chocolate teapot territory IMO
Garmin standalone PND's were seamlessly switched from TrafficMaster to Inrix which is way better anyway
Honda no longer use Garmin mapping on newer models, they now use 'Here' so as a result are Garmin not particularly concerned about fully supporting Honda ?