There's a place for both kinds of explanations. This is a good way of explaining what a Kalman filter is to someone who has a mathematical background, just like if you go look up a woodworking video, it might show an interesting way for someone who is familiar with woodworking to build a chair.
Neither is useful to the novice, but an article like this going out of its way to explain, say, matrix notation, or a video about building chairs that spends the first ten minutes explaining how to use a table saw, is less useful and interesting to the experienced reader or viewer.
I suppose I agree that articles like this shouldn't be presented as easy, or for the beginner, but there's a difference between "simple" and "easy".
Neither is useful to the novice, but an article like this going out of its way to explain, say, matrix notation, or a video about building chairs that spends the first ten minutes explaining how to use a table saw, is less useful and interesting to the experienced reader or viewer.
I suppose I agree that articles like this shouldn't be presented as easy, or for the beginner, but there's a difference between "simple" and "easy".