Almost by definition, maintainability doesn't refer to a "specific part"
https://www.softwareimprovementgroup.com/blog/artcraft-adobe-clone-ai-code-quality/
I'm not interested in getting into an argument about this any further, look through their github issues, there's plenty to learn.
As a note, if you think they're genuinely reviewing this much code at this speed, I think you need to consider the logistics of that.