Why does Rick use 2 poblanos in the video, but the recipe calls for only one? Is the video correct or the recipe? Thanks!

I'm not sure how many of what he uses in the video- and I don't think it really matters. Peppers vary in size and heat levels, so you would have to adapt accordingly. If you wanted, you could make it with one or two- and even use more or fewer serrano peppers, for that matter. He gave the recipe basics, which call for one poblano- average size, no doubt. If you use two, because yours are small, or decide you want more heat and use more- it's not as if he's going to hunt you down and make a fuss.