Which is right but as the syllabus quotes:
Questions/question parts focusing on Core Module 9.1 will be incorporated into both the Core and Options sections of the paper.
When they do this the skills ends up being 20% of the marks they are looking for and will turn up in the marking scheme. You need the background of the module and options.
Eg todays chemistry
The validity and reliability question, the prac questions where they will be looking for the appropriate skills in the design, the appropriate and accurate use of the data in the ozone question, quantitative and qualitative analysis, identifying trends in the metal oxides etc.
So there is no point arguing which 20% is 9.1 but around this amount will be incorporated