I think in terms of characters being nerf by mechanics. He's referring to run cancel characters and characters who were picked for armor due to the recent patch changing stamina and removal of armored launchers respectively. So characters like High Tech Jacqui and Warlock Quan are some of the few that are on the nerfing end of mechanic changes
High tech Jacqui was hurt by the stamina changes, but they also specifically nerfed her as a variation making df2 -1 [from +2], df2(1) less plus and adding recovery frames to df2, significantly nerfing her level2 corner damage (by like 10-15%) and her level0/level1 corner damage (by 5-10%).
As well as nerfing Jacqui overall by making b2 have less cancel advantage.
When I say high tech was nerfed, I'm not just referring to the stamina changes (which lbsh, hurt high tech more than any other variation in the game) but also specific changes to her which Paulo thought necessary for some reason.
That's what I meant when I said she was the most overrated character [I remember all the "OMG Jacqui's block jail wow secret top tier" threads that everyone just seemed to accept as fact] to be heavily nerfed in this patch.
Whatever, she's still hella fun to use and mildly viable in most matchups. Only a couple of 7-3s to deal with.
Cassie Cage got normalized a patch too soon
Cassie Cage has been viable in every single patch since launch. She has never been overrated.