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Unless is is an expected resolution thing with the focal length you might expect from a 6" or bigger scope I am not sure why they specify 6" or above.
I actually grabbed a 60 second frame of Wolf 359 once on a whim and it is clearly visible using my 80mm frac and ASI294 camera. In 5 minute subs I can identify stars down to about mag 17.5 by comparing the sub to stellarium around easily identifiable stars.
If the weather plays ball I might have a go anyway, if the subs are useful to them then fine. If not, fine too.
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