Why are there so many S8 Gold players with 55%+ win rate in Diamond IV?

How did this happen? It's not even people who were spamming games at the start of the season, because their win rate is abnormally high, but they are playing like they belong in Gold. I'm legitimately encountering **multiple** opponents who are losing 50-60% of their health to turret shots while trying to trade with me at level 3/4.
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