Well, the Meguiars field reppointed out the fact to Mosca, so I'd say they are well aware of the fact. I think they meant to put that on the label.
Then again, I've never used #26 paste, so I can't comment on why they would suggest to shake it. I thought I remember people saying it was not a brick of wax, like S100 is, so maybe it is a little bit more like a liquid. Well, thats my guess...