Amazon is an authorized Netgear dealer.
While Amazon is an authorized Netgear dealer, you still must ensure that you purchase Netgear products directly from Amazon itself or from an explicitly authorized third party Amazon seller.
Many items on Amazon are also sold by third party vendors, and it is these third party sellers and vendors on Amazon that may not be Authorized Netgear dealers, which can also affect the warranty support.
Amazon themselves are a Netgear authorized dealer.
When buying from Amazon you should look for the "Ships from and Sold by Amazon" or "Sold by "Authorized Seller" information to ensure that you are in fact getting a product including a Netgear product from an authorized source, which is crucial for any warranty purposes.
Not everything sold on Amazon is sold by and shipped by Amazon so you have to watch out for the information on who is in fact selling and shipping the item.
So sometimes you might order something from Amazon and it may take longer to ship and arrive at your door and it may come through USPS instead of Amazon themselves or UPS.