Did all the player base climb all of the sudden during ONE SEASON ?

So . i was plat 4 0 LP in season 8 and i was 5% of the top players. now im plat 2 20LP and im 8% of top players. Thats so huge if u think about it. 2 divisions up but 3% down of the top.i checked and i saw now diamond 4 0 LP is top 5% players.So all the players climbed a whole Tier in less then one season? Players didnt get better because i had so much better games and better game qualities in Season 8 compared to season 9. but somehow all of the players climbed so hard during 1 season?
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