NP probably doesn't know the answer to your question, they are more of a clearning house, hence the low prices.

The instructions typify most asian ARF's, so going elsewhere doesn't really buy you much in terms of the instructions (with a few exceptions....)

You should see what the many of the CMP and most of the KMP ARF's come with if you thing this is bad.

A good rule of thumb is to always assume that the instructions may be in error.

GP, Horizon and other "big boys" also frequently produce manuals where simple things like the C.G. is totally off...

Fortunately I've searched here before flying planes from those manufacturers to find this out.

So all of this is endemic and not isolated to NP not that this is an excuse...