Well, he's being intentionally reckless and stupid with how he's playing champion and build he's never used before ... in ranked no less... so at some point, he's got to take some responsibility for his idiot decisions and inability to play safe.
I mean, looking at his deaths, he wasn't poking her at all, he was marching right up into her face and then dying immediately. He knows top lane. It's his main lane. Being Diamond, he knows how to play against Riven. He knows her swing range with her mobility, yet he consistently placed himself in her danger range with a squishy mage. Plus, his first death solo against her was due to him having his shop open for some reason while he was walking into a top side bush.
Overall, this game is riddled with idiot plays and his bloodthirsty march straight for Riven every time he sees her. I don't think he was trying to play this game, and a lot of his behavior constitutes what I'd call feeding and inting.
Plus, he also called Riven "retard proof broken" in all chat. That language alone is enough to have a valid report filed against him, especially for someone as high profile and notorious for being a whiny manchild in the League community.