Sion is unbalanced af, he needs a nerf

I went against a sion top lane, and I dominated him, like 5+ solo kill in top. He does not give a shit everytime he dies, He only cares about pushing towers. He gets so many health and splitpush potential from overgrowth and demolish rune its not even balanced. Literally all he did was ult to get to our towers in lane and push, everytime we kill him his passive revives him and continues to push, that shits so disguting it made me angry. How is this balanced? He has so much health it takes 2-3 allies to stop him from pushing, yet he's able to take demolish shots on towers because he's so tanky and ends up pushing even after dying. He doesn't even teamfight at all lol. While we stop sion, enemy takes other towers and objectives. Once sion gets enough health stacks and steraks gage, incredible amount of shield from steraks (based on %health) and tenacity, we cant kill him fast enough so he ends up taking objectivs and die. We easily killed enemies, but this sion just keeps on pushing inhibs so we cant even do anything even after we kill them cuz of super minions. This style of gameplay is not healthy at all, he's not even supporting team as a tank, he's just being tanky for himself so he can push