Yes, as I said, there are two grounds. Only four wires are needed, I think the two grounds were there to make wiring easier.
Most of the TMCC ones are as Hancock52 states, totally shrink-wrapped. However, later TMCC and early Legacy started bolting the triac to the chassis to aid with heat dissipation to try to slow down the excessive failure rate of this module. Not sure how successful they were, but that's the rational for exposing the triac.
FWIW, the metallic side of the triac normally faces down on the chassis on top of the insulating pad, then the insulating bushing goes through the hole to insulate the screw from the metal base and into a threaded hole.
