Keep in mind that this is 130 million by 2022. So the average it will sell per calendar year is 21.6 million. The only systems that got this high annually is the Wii and DS. The DS went as high as 30 million per year. So this isn't too far fetched. We will just have to wait and see.
I think this prediction is a bit too high but the Switch keeps outdoing my predictions so we'll see.