Hi Art,

From what I can make out the fastener screw looks to be both TORX and possibly a hexagon on the outside.
That would be a novel idea to provide the capability to use either tools.
It would still sell the same amount of tool sets.

It might eliminate some of the frustration of taking a double check 👀 too see if an Allen hex socket head was substituted 😊 from a spare parts stash.
Mix and match on our old cars is bound to happen.

Phil