is 'Study Humanism ... where appropriate' - a 'paper tiger'?

The generic 'teach Humanism .... where appropriate'  term is apparently inserted in many Agreed Syllabus in England.

In the Dorset Agreed Syllabus 2005 the 'where appropriate' terms is used in connection to secular philosophies or Humanism on pages 34 & 40:-

During key stages 2 & 3 ... the pupils should be taught the knowledge, skills and understanding through the following religions, themes, experiences and opportunities: ...  the world views of pupils, including, where appropriate, secular philosophies.


Are teachers more likely to exclude studies of secular philosophies because of the 'where appropriate' clause? Or is it just a paper tiger term? Should the study of secular philosophies such as Humanism be mandatory or studied, if appropriate?

When is a secular philosophy such as Humanism ever not appropriate?