The French have seen their wages grow at 1/4 to 1/2 the typical rate of American wage growth for the last decade. They do not lack for collective bargaining.
The American median wage is higher than the German median wage. The Germans do not lack for collective bargaining.
The American economy and median wage has outperformed: France, Germany, Spain, Italy, Finland, Britain, among many other developed nations.
The American median wage is also higher than: Sweden, Finland, Netherlands, Germany, France.
The American median wage is so high, nations such as Britain barely qualify as matching up with our poorest states.
So much for your theory.
To meaningfully compare countries you need to either compare the gross wage costs per employee that a company actually faces or compare the net income of employees after all taxes. And correct for purchasing power of course.
You can't make incomparable values comparable by reducing them to a ratio, except in special cases.
There is a strong union presence here - both for normal employees and management. There are also actual laws to protect workers. This includes things like paid vacation, paid time off if you are sick (more if you have children), paid leave after having children (some of which can be split between the parents). Everyone is entitled to a job contract - even for temp jobs or fast food workers. Not all of the costs for the benefits is paid for by the employers: Healthcare is a tax, vacation pay is withheld from the employee's wages and paid the next year, and the government (taxes) pay for sick or parental leave.
Nope, it isn't perfect, but it surely isn't representative of the picture you paint because the one you paint leaves out the quality of life stuff.
The American Salary is higher that Germans, but Germans also work less hours on average (with higher productivity mind you, but that's not important at the moment). It actually comes out to Germans having a better median wage.
https://www.quora.com/Are-Germans-content-to-earn-19-less-th... (I wish I had a better source, but I can't find the original data that I made this conclusion before with).
https://en.wikipedia.org/wiki/Monetarism
then he doesn't have a point at all.
I'll leave the rest as an exercise to the reader.