Hey look, it's someone who misunderstood what tier lists mean...?
A tier list indicates the LIKELIHOOD of a particular result, given players of the same skill level (generally assumed to be "as high as players can currently get"). 7-3 doesn't mean "gets stomped all the time", it means "on average loses 70% of the time". If someone has a really on day with that character, or those 30% likelihood wins line up, they can get far.
Pepeday or Kuroda winning with a character considered not-high-tier just says something about Pepeday or Kuroda, not the tier placement of the character. The tier placement considers the character's capabilities in comparison to other characters, not a specific player's capability with that character. The absolute tier list for 3s didn't change to move Q higher as a result of Kuroda's victories, because as a character Q still is lacking a lot of things when compared to the rest of the cast.