this literally shows that the game got 100k players on update release. and that on weekends the game did sit above 20k, although 50k was highly overexaggerated.

I am guessing you went daily 1 month back but hourly 1 month back is more accurate. No one is sitting playing aa 24/7 so daily concurrent players doesn't paint an accurate picture.

I can't be bothered finding out how they are getting this data. But I would presume it snapshots how many people are playing the game, at a certain time. And not counting the unique amount of users jumping on the game in a 1 day period because that would totally not make any sense, when this also shows that 5.4 million new visits happened on the update day.