That pic looks common with what I've seen on an overzealous lube of the splines, especially because of the silvery color, moly grease looks like that...
On all the units that I've seen with actual seal issues, you will see it dripping at the bottom of the housing, and it won't be gray/silver, but golden /yellow lube.
Easy to check though, let it sit overnight on the sidestand, pop the cap off... have rags handy, and if it overflows it had too much lube... simply suck some out using a turkey baster.... clean the rim and keep an eye on it. Next tire change clean the splines, and don't over grease them..