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My thoughts on your question...
What might be misconstrued here is that you would see the offset at the secondary. As mentioned in the article the difference is fractions of a degree variation in the tilt of each mirror, and the drawings are exaggerated.
I suspect that if you look at the secondary reflection, as closely, as safely possible, the laser dot will be just slightly elongated, the beam width will not be tight enough to see 2 distinct dots.
At this point a star test would be the next best verification of how well the optics are collimated.
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