It has been posted hundreds of times you need to win leaver queue games now. Merely playing through them is not enough as of August 2019.
have played 10 + games in leaver match some wins some losses all are the same result, i still need to play 1 leaver match to be remove from the status, this has been going on for DAYS now.
I will not speculate whether such a player is just afking or throwing leaver games on purpose, but all you need to do is win 1 game and it will go away.