Can someone explain to me how good players smurfing can solocarry games?

Title. I see these Diamond+ players smurfing in Silver and such solocarrying games and having like 95%+ winrate. I get you can stomp your lane, get fed and go for objectives, but how do they do it with 4 other people running around, often times feeding and not knowing what the hell kind of plays this dude is doing?
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