Maybe you and the author are considering different periods, e.g. A. what % of all videos generated the majority of overall watch time over the last week? B. w

Maybe you and the author are considering different periods, e.g. A. what % of all videos generated the majority of overall watch time over the last week? B. what % of all videos generated the majority of overall watch time over the last year? If the watch time is growing by a high percentage month-over-month, perhaps the numbers would be similar. But, if overall watch time is flat, then you'd expect A to be much lower than B.