How so? When you count viewership, of course they will combine number of viewers from each match, considering most of the viewers will tune in for just a few matches. This is common sense, I don't think there is anything suspicious about that.

Think of it more like 4 billion "views".

If 1 person watches 6 matches they count as 6 "viewers" for those statistics. It makes sense if you're trying to track retainment for an event that's broken up into several instances.