Can we have link?
Here you go. The lady mentions the SSSensational.gif and asks if it's been fixed, which Alex Jones simply replies that it has.
Cam gameplay of EuroGamer demos and onward even shows that playing the game by spamming Rebellion with little variation in attacks or weapons also never gets anyone higher than a C, maybe a low B if they're lucky to catch more than one enemy in the swing.
One of the big things that even the guy who originally recorded the footage that the gif came from mentions is that Tremor (Arbiter's skill used in the gif) hits hard and creates a wave that was striking Poison's larger hitbox multiple times as it passed through her. So while we only saw four swings of Arbiter, there were actually way more hits. There's also the fact that Poison was stunned, and any time enemies are stunned damage is modified, and so is your Style score for exploiting that opening.