Can someone explain this? "Umbrella projects ... [are] a really great concept that allows us to have multiple microservices living in the same codebase, while g

Can someone explain this? "Umbrella projects ... [are] a really great concept that allows us to have multiple microservices living in the same codebase, while giving us the flexibility to scale each service separately". How is this any different from just storing the code for multiple services in the same repository?