No typo, they used VGC or EA numbers (the 103M PS4 + XBO at the End of 2017) for the 30M but switched to another source (probably some "analyst") which probably showed ridiculously inflated unit sales
The funniest thing about this is that they are projecting the Xbox to nearly double it's current base in 1 year. 26 million in a year would be nearly 90% of the 30 million that they site for end of 2017. Or roughly a 300% jump in YoY sales... after 4 years for no reason.
This impossible scenario leads me to believe that Switch will win simply because of the unrealistic boost we need to give Xbox even to have this conversation.