Disregarding how horrible it is to do that this way, ... The employee says he's french, so either he didn't have a french work contract, or what he is saying is untrue. While you can transfer an employee from one company to another, it must protect every employee advantage, his history, etc ... So he has the same severance as on his original contract, with the original timeline (his time of employment isn't reset to…
> The employee says he's french, so either he didn't have a french work contract, or what he is saying is untrue. Most likely he is employeed in Amsterdam, where Dutch law applies. There’s local contract (for sales) but CS are concentrated in Amsterdam.
Also the move would definitely be illegal in the Netherlands too.