You can't just judge things on one or two reported stories. if the authorities here think this man is lying about coming from Zimbabwe, then maybe he is lying!All his story may be made up, as well.
As for the Algerian geneticist , why not go to France, Algerians speak French as well don't they.If she wanted to be here with her husband, and his job for the moment is here working for an oil company as an engineer, she should not need to work in a kebab shop, as he will be paid quite well.She may not be able to do anything in the genetics line here for various reasons.