I fail to see the logic there - and the link to the newx website didn't make it any clearer.
That's like saying all Suzukis have weak front diffs because the GV has a weak front diff - when in reality some GVs (those with aluminum front diffs) have weak diffs, whilst others don't (some have steel diffs) and there are very few complaints about the Samurai & SJs.
As far as I can tell - in reality even the so called weak GV diffs are upto the task that Suzuki required of them - they don't start to break until folks start to abuse them, larger tires, lower gears, rock crawling, etc., etc., etc., - in my neck of the woods, it's mud & sand, and I've never heard of anyone here breaking one.
Where's your evidence ??