Riot we've been saying for a long while Ornn needs nerfs, and as a person who probably will be putting him into permanent use once I know he isn't gonna be in PBE limbo, I know he needs nerfs. The thing is you're finally doing the damage nerfs after you've nerfed his mechanics. Give Ornn back his unstoppable and keep these damage nerfs. The CD increase is fine too, but the shield length and removal of unstoppable are nerfing the best parts of Ornn.
If you readd the tank aspects to the W with the current dmg and Cd nerfs as well as the brittle nerfs Ornn with have a tool that he wants to use in certain situations instead of spam and be rewarded for no matter what.
This is the exact kind of double dipping nerfs you seem far too keen on riot.