HOW MALPHITE CAN DO SO MUCH DMG

GUYS EVERY GAME I BAN THIS CHAMPION BUT IN 1 GAME I DIDNT BAN HIM. HE LITERALLY WENT FULL TANK WITH 0 AP ITEMS AND HE SOLO CARRIED 1VS5 . HE DID 50K DMG AS TANK LITERALLY MOST DMG ON THE GAME.HOW A TANK CAN BE ASSASSIN AND UNKILABLE AND AP CARRY AT THE SAME TIME I CAN NOT UNDERSTAND

LETS SAY A BIG TY TO THE RIOT BALANCE TEAM GG WP IM WAITING FOR MALPH NERFS(WHICH IS INPOSIBLE)