That's a bunch of photos from the same camera, not 2 lenses at the same time

I know, I just don't think it's a huge jump from "take multiple photos over a 2s period from one camera and stack them" to "take several photos from discrete physical cameras and stack them". As a subscription of paid app I am not the target market for the person who made this, I agree with another person commenting in here that said they should be working for a phone manufacturer.