Need help with understanding methods of SystemInterface.

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Hi. Sorry for my mistakes. English is not my native language. So, I'm porting my Noetic project to Foxy and I have quite the amount of trouble with understanding how should I port controller. To be more specific in Noetic I used RobotHW, now I need to use SystemInterface. I check some examples that are listed here and maybe it is something obvious, but can't understand, why then using SystemInterface not all required for overriding methods are override. For example, here get_name() and get_status() is not override. So in the end I need clear understanding of what to do with this two methods. Appreciate any help.