It doesn't say a year you are correct.
I am going down this route myself, starting a postgraduate certificate in May, which finishes in November ( full time course at university ). It is a years course, but I am completing it (hopefully) in 6 months by taking two semesters at once. My university is pretty clear that it is a full post graduate certificate equivalent to a year of study, so in theory it should boost my points.
The true challenge will be with the ECA institutions, which are in my experience so far, completely useless and not fit for purpose and certainly not worth the fees they charge. I have an email from one, essentially saying "yes we agree that your study is in excess of what we accredited you with, but we are ignoring that because it doesn't fit tidily into our tick box exercise"....... the other one actually change their website after I showed them my credentials were catered for on their own website material ( which you can still evidence via the way back machine ) and I have stored the HTML files.
So I would say pursue the extra study at your own risk, even if it is completely valid, does not mean the likes of WES or IQAS will treat it as such.
For what its worth I am documenting my entire process to share with others, next year is my last roll of the dice before I give up as my cripplingly advanced age of 36 essentially cuts me off from entry into Canada, even if I achieve a PHD.... so at that point I will share everything I have in some way so that others can learn from what I have experienced.