No. Current syllabus began in 1990. It says on the second page "For implementation for Year 12 in 1990.":
Perhaps you should have pasted the entire quote.
Syllabus approved by the Board of Senior School Studies in February 1980, with amendments approved by the Board of Secondary Education in October 1989. For implementation for Year 12 in 1990.
Those of us who have taught with both versions of the syllabus know that these 'amendments' were merely clarifications. The previous syllabus document was only 2 or 3 pages long, and this new syllabus document (not new syllabus) explained the content in much more detail. But there were NO changes to the content.
And despite what the second page says, the document didn't make it out to schools until 1991. Many teachers weren't even aware of its existence for another 12 months - there was no big deal made as would be the case with a new syllabus.