Something interesting about the video is the idea that the genocides written in the Bible never happened, just a way in which one identifies a warrior Yahwe.
You have to realize though no one disputes there are some fiction in the Scriptures, the underlying reason for these stories are disputably there for a slightly different reason than the video presents (in Christian understanding, it's a veil of NT allegorical understanding). In addition, some of the verses mentioned that are considered "proof" for polytheism is also disputed. These verses are there to falsify other gods, not to say that Yahwe is the most powerful of other "existing" gods. We argue that Abraham, Isaac, and Jacob knew exactly of an only God, and cursed other "gods" showing the strength of a One true God. I can say my sister is the best sister in the world, and yet she's my only sister.
So, these stories are offered as refutation of polytheism that exists around them, not "hidden" polytheism. How do we know that the word "Yahwe" wasn't a coincidental word for a warrior God and at the same time the "One God" for the Hebrews? It's like the word "Allah." It has always been used to mean "God" but can also be the moon god of Hindu religions.
Finally, there remains no proof yet of this hypothesis of hidden polytheism. You need to find manuscripts that show substantial differences and cutting out of verses that clearly indicate an exclusivity of the One God. So far, we found the Dead Sea Manuscripts that show quite the opposite, an affirmation of the integrity of most of the OT scriptures. We also have a religion, Zoroastrianism, that shows elements very similar to Monotheism, which claims its ancient roots along with pre-Judaic Abrahamic times, and perhaps Zorastrianism and Judaism share some sort of a common ancestor that has these Monotheistic tendencies. This at least shows that Monotheism may have had a much more ancient root than what the video proclaims.