10-0 in placement matches on a fresh account : Plat V ?

Cowsep (a popular streamer) reached plat V on a new smurf by winning all his placement matches. I am wondering how is this possible since I thought gold was the highest thing you could achieve if you are on a new account ?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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