In his own grammatically incorrect words he said and I quote "It win 7 times arrow In KOG." So yes, he did claim to be KOG with this laughing stock of a deck
Lol KoG is the final rank! If he says winstreak in legend, he prob claim that he reach KoG using this deck. But if he says winstreak in KoG (which is the case), doesnt mean he climbs up using this deck