I agree.
I'd pass on that one because you're not getting much of anything.
In fact, it says the tail light, itself, is not included, and the one shown in those pics looks a whole lot like the one that comes from Yamaha's own 2007-2011 WR-250F and WR-450F.
The DRC Edge unit that lots of WR-250R/X rider go with comes with the light and license plate holder.
The only thing extra you have to get are rear turn signal lamps, unless you decide to use the original ones.