Olinser, where are you getting this data from?
I have a pet theory. A lot of people are still leveling W first on kog, which is completely wrong. If whatever tools you use can tell you what the skill order winrate is, that would be actually useful.
The fact that I can shred a fed Garen to half health in 6 seconds with only a Rageblade and a cutlass tells me that his autos are perfectly fine once you get an item under your belt. And yes, this Garen did have tank items, he wasn't just going full damage.
I also disagree with your assessment that this is a terrible rework. I don't think he'll ever be a solo-queue powerhouse because he requires a bit of investment by your team to keep the squishy alive. For this reason, I shudder to think of what a Braum/Kog lane would look like. Giving an artillery piece a shield from incoming fire is really scary.