why the Class AeroSimRC didn't override the HIL method in the source code?

//the sourcecode is below
namespace ArdupilotMega.HIL
{
class AeroSimRC : Hil
{
}
}

I'll be appreciate if anybody give me a clue.

Start by locating the ArdupilotMega.HIL namespace and the AeroSimRC and Hil class declarations in the Mission Planner source. Compare Hil's HIL methods with any derived-class implementations to determine whether AeroSimRC is expected to override one; the issue provides no named file, method, or acceptance criteria.

Written by the indexing model from the issue text.