SusanneLinder
Your link also states the following:
"Under Curriculum for Excellence, we expect all young people to experience and enjoy a rich general education to the end of S3, with no need for qualifications to provide additional motivation.
It is important that the full period to the end of S3 is used to provide a rich curriculum that provides breadth and depth in learning. The expectation is that young people will reach a secure level of attainment and achievement at the end of S3. The broad general education is designed to provide a very sound basis for more advanced study within the senior phase, including qualifications."
If schools continue the BGE through to the end of S3, then there is no way they can timetable more than 6 Nat 5 subjects in S4. Schools offering 7 or 8 Nat 5s in S4 are doing it by cutting short the BGE and starting the Nat 5 courses at the end of S2 or early in S3.
I suspect the info in your link was written before anyone realised the impossibility of timetabling 8 subject courses in one year.