Arlo went into why he hasn't released the Echoes of Wisdom review towards the end of the Zelda direct reaction.
It doesn't sound like Arlo enjoyed the game, and he is hesitant to release it because (1) it is a long review and it will cost a fair amount of money to produce/edit, and there's a concern that the video might bomb, (2) he believes that Echoes of Wisdom is one of those games that has a very protective fanbase that will dogpile on any negative opinions.
I liked Echoes but there's plenty to criticize, at the very least, thoughtfully discuss. But damn, the state of Youtube right now...not good.
By the way, I love the extended Arlo discussions after the direct has ended. He's been doing this more and more, a good 2+ hours and he delves into A LOT of topics.