Champion stat history

Sorry if this is in the wrong board, havent posted much.I rarely have been on lolking but the area where you see (CHAMP STATS (PAST 25 DAYS)), How accurate is that and does it kinda show how good you are overall? I know the common sense, but you'll see what I mean after I say what's next. I'm not the Best player and I know it, been playing 6 years though so I'm well off. I'm in Bronze 4(basically start season 6, and for Jarvan I'm only level 4 mastery but every single stat (damage taken__winrate__minions__gold, etc) of mine on lolking for jarvan are positive and better than every rank including master/challenger. I'm not full of myself or anything, but that's why I'm asking lol, I don't claim to be much.

If this helps you may be able to see it for yourself. http://www.lolking.net/summoner/na/28693073 e46jmp

Thanks in advance, yo ggwp