Why champion.gg isn't the most accurate for stats.

Title Edit: For extrapolating stats to a champion's balance state I'm stating you can't extrapolate a champion's balance based just off of champion.gg's winrate stat ALONE.

So on champion.gg it says Kog'Maw has an overall winrate of 55%. That does kinda make sense in plat games and above but then I looked more in depth. He has the third lowest playrate of all ADC's at just under 1%. But what caught my attention is the win% by games played. All looks normal, until you look at 50-125 games played. In that group there's a 97.8% winrate. That doesn't make sense since in the piechart below the graph it says players had 50 to 125 games played in 7.5% of those games since roughly 1000 games were analyzed in the current patch, that would mean that out of those 75 games only 2 would have been lost. Champion.gg isn't going to be accurate for its stats when there's this little amount of games played on a champion and one person (I assume) skewing the data a shit ton.