Hi. For your information the processor of Nexus 9 is 64 bit. But you might ask how Nexus 6 is getting its Android Nougat upgrade, though its processor is 32 bit. Though I am not knowledgeable like the anandtech guy, to my knowledge it is almost impossible to run a 64 bit Operating System on a 32 bit hardware. Google is possibly doing this by modifying the Operating System’s Kernal to 32 bit. In other words, what I would like to convey is that there are two versions of their Operating system 32 and 64 bit. Google might be doing this to their line of products to increase their brand image/value. Moreover, I doubt whether their two versions of OS are open to other brands too. Even if they are open, I think other brand manufacturers will not be interested in doing the same since they’ll not be interested to increase the life span of their older product line ups.