Why is the compiler not generating any RTTI?

Question

I'm playing around with the OmniThread lib, adding some functionality to the pipeline class.

I now want to add some attributes, but for this to work I need the RTTI to be generated.
It turns out that RTTI is disabled for all of Otl, by using the {$TYPEINFO OFF} directive.
Setting {$TYPEINFO ON} globally breaks the library, so that's not an option.

I'm trying to selectively enable RTTI for my own classes.

{$M+}
  {$RTTI EXPLICIT METHODS([vcPrivate,vcProtected,vcPublic, vcPublished]) PROPERTIES(([vcPrivate,vcProtected,vcPublic, vcPublished])) FIELDS(([vcPrivate,vcProtected,vcPublic, vcPublished]))}
  [Capabilities([SplitInput])]
  TOmniMultiPipelineSplitter = class(TOmniMultiPipelineStage, IOmniMultiSplitter)
  public
    /// <summary>
    /// Creates a splitter with 1 input and 2 outputs.
    /// Additional outputs can be added later if required.
    /// </summary>
    constructor Create; overload;
    constructor Create(const Input: IOmniBlockingCollection); overload;
    constructor Create(PrevStage: TGUID; PrevQueue: integer); overload;
    function AddOutputQueue: IOmniBlockingCollection;
  end;
  {$M-}

But no matter what I do the RTTI does not get genererated.

Here's the code that I'm using to get hold of the RTTI for my class:

  function FindAllFlavoursOf(basetype: TClass): TFlavours;
  var
    ctx: TRttiContext;
    lType: TRttiType;
  begin
    Result:= TList<TClass>.Create;
    ctx:= TRttiContext.Create;
    for lType in ctx.GetTypes do
      if (lType is TRttiInstanceType) and
        (TRttiInstanceType(lType).MetaclassType.InheritsFrom(basetype)) then begin
        Result.Add(TRttiInstanceType(lType).MetaclassType);
      end;
  end;

This code finds nothing for classes derived from TOmniMultiPipelineStage, however it does find something for classes derived from TInterfacedObject.
All classes with generic parameters seem to be included.

How do I get Delphi to put RTTI in my classes?

-- Yes, I did enable RTTI in the project settings:

-- Yes the classes are used in my code. I run a pipeline that uses these classes when I press the Go button.