> First of all isn't that the wrong way around and should be the value theory of labor?

No; https://en.wikipedia.org/wiki/Labor_theory_of_value is an established term and has been for centuries.

> what is wrong about the concept of surplus value and labour power? ...what social/economic theory falsifies or even contradicts the concept of labour power and surplus value and in what way?

The theory has also been superseded for centuries: https://en.wikipedia.org/wiki/Marginalism