Heimer grenade bug? Or HARDNERF not listed on patch notes?

So, as if the 50% dmg reduction on heimer ultQ wasn't enough of a hit, and the bunch of years accumulated not fixing the damn bug of turrets not shooting the cannons properly, they now reduce his grenade stun durarion for 1 second, to 1/5 of what it was. Is this a mistake or should I become a 100% dedicated teemo main?
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