labour curve

Is it also true that the higher the learning rate is the slower labour learning is because employees are taking longer to learn.

A learning rate of 70% means faster learning of labour than a learning rate of 90%

A learning rate of 90% means that labour is taking more hours to make the production due to either because new employees are hired or we are having problems in the production process.

We can reduce the learning rate by employing professional or skilled labour even though it might be costly.

What I wrote is true?