I mention it because 51 million Xbox One's have been sold.
around 24 million original Xboxes were sold
Around 62 Million NES were sold
Around 30 Million Atari 2600 were sold
Around 3 million Intellivisions were sold
Around 2 million Coleco were sold
Around 1 million Atari 5000s were sold.
These numbers are known. To see just how much smoke may be blowing at you by a marketer, I find it is a good reality check to compare sales to see how truthful it may or may not be. If you are living when these consoles are popular, you can get a feel of how popular they are by how much you see them in stores, how much people talk about them, how much they are known by the common individual and are USED by the general population around you.
It may be that the numbers reflect the same popularity as other items in your experience.
For numbers on consoles a source is here
wikipedia on console sales