This is very interesting but I wonder why did the caption read Hindu Rinchen Zangpo. That caught my eye and I expected something radical like the fact that when he travelled to India and was first influenced by Hindu philosophy. As far as I know, there were no Tibetans who were interested in Hindu philosophy as they were all staunch Buddhists.
So much so that Hindu scholars would even debate with some Tibetan scholars and be defeated on the their home turf. An example of this would be excellent Sakya Pandita. Perhaps the wrong label was due to confusion of the surrounding tantric deities around Rinchen Zangpo. Whatever it is, Rinpoche Zangpo was a great Buddhist scholar and translator. He's one of the pivotal scholars that was instrumental in the transmission and translation of the vast body of Buddhist scriptures from India.