I see no reason why the club face would open/close on its own as a result of interial forces.
The club is on a tilted plane, and thus has the 'out' of down, out and forward built into the physics of the machine and the design of the club.
IF
the machine is perfectly on plane - the line of pull.
The design of the club will pull the toe 'out' for proper impact. Try swinging a hockey stick, or any number of aids that exagerate the 'toe' of a club, they force that shaft to turn around the COG - sweetspot.
A perfectly on plane swinger, or machine, doesn't need to cause the out. Realistically, nobody is that perfect, so the release is often 'caused' by the golfer (release swivel).
the design of the club, and the physics of the COG plane, require that the shaft rotate around the sweetspot (per Ted's baseball bat example).
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