I think he meant Umineko not being a direct sequel to Higurashi, since it's new people.
I'm an editor of The Witch Hunt (the group doing the novels), so trust me, don't think that it doesn't have ANYTHING to do with Higurashi... it actually has quite a lot to do with it. I don't want to spoil anything, but imagine that Higurashi is a series in a box... and your view point was from inside that box. Umineko is the viewpoint from outside the box.
Ryuukishi07 is building his own myths, world, and history in the When They Cry series, and Umineko only helps flesh it all out. You won't get anything direct, but Umineko will help you better understand Higurashi.
The anime just started too, so make sure to pick it up
Though I'd advise against watching GG/Coal's subs... they're pretty inaccurate when it comes to names and important points. Wait for the "Sea Cats" group, who should be releasing episode one soon (their main translator was away on vacation this week)