Simply put, JustDecompile does not yet recognize the true and false operators used in C#. You can do public static bool operator true(MyType t) {/* implementation */} and same with false. This results in IL:
However, when decompiled to C# it shows up as:
Also, when used the operator shows up like this:
The last point is also valid for implicit operators where they show up as MyType.op_Implicit (haven't tried explicit ones yet).