What is the type of element (of a collection) which retrieve from using Activator.CreateInstance method?

I have a case which is very similar to the case below：

Get all inherited classes of an abstract class

I have two classes which inherited to a base class

this is my base class:

public abstract class InputModule
{
      public string ModuleName;
      public int NumberOfInputFields;
}

And this is the first inhertied class:

public class Module1 : InputModule
{
      new public string  ModuleName = "FilmMusic";
      public new int NumberOfInputFields = 7;
}

second:

public class Module2 : InputModule
{
      new public string ModuleName = "MovieStaffInfo";
      public new int NumberOfInputFields = 4;
}

And I want to get the value of ModuleName: "FilmMusic" and "MovieStaffInfo".

With the value, before user entering the main form, I could add a new UI (UI for FilmMusic Module and another UI for MovieStaff) to the main form.

And below were the codes I have used (most referred to the case I have mentioned above):

public void detectTotalNumberOfSector()
{
     IEnumerable<InputModule> exporters = typeof(InputModule).Assembly.GetTypes().Where(t => t.IsSubclassOf(typeof(InputModule)) && !t.IsAbstract).Select(t => (InputModule)Activator.CreateInstance(t));
     foreach (var item in exporters)
     {
         Console.WriteLine(item.ModuleName);   
     } 
}

And I got the output "null, null"

And I added those codes inside the foreach loop:

FieldInfo info = item.GetType().GetField("ModuleName"); 
Console.WriteLine(info.GetValue(item));

I have got what I want "FilmMusic, MovieStaffInfo".

I am a little bit confuse, what the elements inside the exports collection ?

At first, I guess the item is an instantiation of class Module1, Module2...,therefore I could use item.ModuleName to access the value of ModuleName.

Actually, I can't, I have to use FieldInfo and GetValue to access the field value, but it is also strange, because using GetValue I have to create an instantiation first as a parameter assign to GetValue (in my case, the item is an instantiation of class Module1,Module2... I guess).

So, are the items of the collection exporters an instantiation of class Module1, Module2 or not?

If they are, why I got null when using item.ModuleName ?

Thanks for any opinion~