Following the instructions is no guarantee against greased brakes. Brand new seals can be easily damaged or nicked when installed. In fact there have been reports of the inner bearing grease hole doing just that when the drum is slid into place. It seems that the hole was/is (not sure if this has been addressed by the manufacturers) causing the seal damage from it's sharp edge. The fix was/is to carefully chamfer that edge with a dremel. Of course one cannot tell if the seal was damaged in this way without removing the drum to check it.... But then you have to reinstall it, chancing damage again.
Of course it can be damaged even for those that do not use the EZLUBE feature.... But at least they will not be pumping grease against a damaged seal.