You are correct per page 28 of the 7th edition when the #3 accumulator is zeroed out in basic motion the clubhead travel and rythym will be that of an angled hinge.
However the hinge action can still be
horizontal with the toe of the club pointing along the plane line, angled about 45 degrees across the plane line,
or vertical about 90 degrees across the plane line with the clubface looking at the sky
and alway with a flat left wrist vertical to it's associated plane
as stated in paragraph 2 on page 28.
Hinge action by definition is holding the flat left wrist vertical to one of the three basic planes and it can be varied in basic motion to achieve a desired result.
Sorting Through the Duffer's Bible.
B-Ray
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