Even if his story is wrong, smurfs are cancer. The whole idea of a ladder system is to have balanced competitive games with an accurate skill ladder. Smurfing goes again the very core concept of the ranked ladder system.
On my team or not, its toxic behavior. Smurfs also don't give a fuck because its not their elo, its practically equal to trolling. Then players get carried that shouldn't, players get shit on- games feel random. The player getting shit on often gets flamed because other players don't understand its a smurf. Its toxic as fuck.