In my experience, a no shaming culture is one where mistakes get fixed instead of hidden, and everyone can learn from them.

Fwiw, I work for trading firm, which trades 10+ billion dollars daily and mistakes can be incredibly costly. I would argue the lack of shame associated with admitting mistakes is vital to our level of code quality.

I have yet to meet the developer who does not make mistakes. I have met a few arrogant enough that they'd never admit to them.