Barozi on 12 March 2017
it's just an estimate, exactly like our numbers.
For example the link you posted is from January. That means it's probably showing data from the end of 2016.
But we already know that PS4 sold 53.4m at that time.
https://pctechmag.com/2017/01/sony-at-ces-2017-53-4-million-ps4-consoles-uncharted-4-has-8-7-million-total-copies-sold-globally/
