I just happened on to this article right after leaving a website that assumred me that the Onkyo TX NR636 HAD true HDMI 2. At Amazon, the listing's description only says that its HDMI supports 4K video at 60 fps; it never says HDMI 2. At the time, I assumed that this meant it was HDMI 2 since that is the standard outcome of the higher rate of data transfer. However, after ordering and then reading this article, I am left with much doubt. I've written the company that is selling the AV through Amazon to see what it says; and also the website (Wirecutter) that made the asrruance of HDMI 2 to see what they say. I did not see any easy way to query Onkyo at their web site.
My questions to you, if you can reply, is to ask, #1, could there have been a change, some sort of upgrade that means that Oknyo now is offering full, true, complete HDMI? #2, even if yes, how could it be possible that they could use the term HDMI 2 but not have it at full capacity. Wouldn't that disqualify them from using the standard which becomes a guarantee that they are telling the truth.