https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2851986281/44344370?tab=overview
His one skill scaling with AP isn't quite as op as Shyvanna's two skills scaling with AP, but it definitely puts him ahead of Riven's 0 skills scaling with AP.
But no, I was making fun of OP 'cause Sion's current meta build that everyone's complaining about gets about 0 damage from ratios, relying on his high base damage and hp scaling to bully his lane opponent. Not only would it be a ridiculous overreaction of a nerf, it would also have next to no impact on how Sion works right now.