AsyncEx.Context question (dotnet core)

Program.cs

using Nito.AsyncEx;
using System;
using System.Threading.Tasks;

namespace AsyncEx.Context.ConsoleApp
{
    public class Program
    {
        public static int Main(string[] args)
        {
            Console.WriteLine("Hello, world!"); // Main thread
            var result = AsyncContext.Run(() => MainAsync(args)); // Main thread
            return result; // Main thread, worker threads exist
        }

        private static async Task<int> MainAsync(string[] args)
        {
            await Task.Delay(100); // Main thread

            // Executes on main thread, but worker threads exist from
            // this point onwards until the program terminates.
            var task = AsyncInMethodSignature();

            var someMoreWork = 10;

            await NoAsyncInMethodSignature();
            await task;

            return someMoreWork;
        }

        static Task NoAsyncInMethodSignature()
        {
            // This method executes on main thread
            return Task.CompletedTask;
        }

        static async Task<int> AsyncInMethodSignature()
        {
            // This method executes on main thread
            await Task.Delay(100);
            return await Task.FromResult(1);
        }
    }
}