It's very common for shops to add grease to the bearings on new hubs. I've injected grease into sealed bearings using a needle, and I know others do that too. I don't see any reason to use solvents on parts that I'm taking apart for inspection, and have shown themselves to be clean, free of contamination and not worn.

Before you call me names, do pay attention to what I actually wrote, and not what you'd like to pretend I wrote. I expressed no opinion about the suitability, or lack thereof, of any particular product. I merely made an entirely factual statement that there is more to grease specification than just its NLGI number. I'm on the record as saying I won't use grease from Phil, Park, or any of the other bike grease specialists, not because they make inferior or unsuitable products, but because they don't publish their spec sheets. I can't make a judgment of their suitability without it, so I don't, and use perfectly acceptable grease obtained elsewhere. That it's the same grease I use on lots of other equipment is just a bonus.