Residence card of a family member of Eu

I really need some advice about this travel document. My elder brother, who is 26yrs old, has travelled alone to Germany two months ago with his Italian travel document (picture shown). The purpose of the travel was to live and work there. Therefore, he applied for the visa in Germany and it still under processing by taking a work contract. But some people were telling him that he needs to go back to Italy and apply for a visa there as he is not anenter image description here EU citizen right now. He is very anxious so can anyone please suggest to me was the visa processing option correct?. And What should he do next?. Thanks in advance.