Um no, all components in the frame are not rotating. The mirrors, the source, the whole shebang are in a frame of reference.
The rotation you speak of is playing the usual relative-observer game... jumping in and out of frames to dismiss when convenient...
That link you posted is a shining example of a misunderstanding of the experiment. In this experiment, the light source, the mirrors, are all in the frame... nothing is rotating with respect to the measurements... with that link... you "jump out" and say 'ohh but the frames rotating'. Sorry, the components within the frame involved in the experiment are not rotating, they are however recording a c+v and a c-v.
Cheers,
Alex
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