I believe it is. Apparently these vendors don't read the item description on the main page which says BY MICROSOFT.
I also want to forewarn others - DO NOT PURCHASE ANYTHING FROM KECS USA - as they are selling generic drives as well. All they had to do is sell it under the generic description but instead they sell it in the official Microsoft listing in order to double and triple their returns. This vendor is also very rude and negative and I'd avoid them at all costs!