How does "one radish weighs a kilo, but two donkeys can't pull it" reflect the Great Leap Forward?

Exaggerating the size of radish is one of the characteristics of the Great Leap Forward. At that time, there were many such extremely exaggerated expressions to illustrate the rapid development of socialist construction.

I don't know where you read this sentence. Personally, I don't think it's too obscure, just exaggerating the size of radish. At that time, many slogans and posters were like this.