You're missing the point. India alone accounts for over 1/3rds of sham marriages (by some IRCC estimates). No one is arguing that other countries do not have fake marriage issues. This thread is simply asking if this practice still continues in large numbers from India given that most who are interested in coming to Canada can simply choose the student immigration stream now.
I don't really know what you're getting at or actually trying to find out or what exactly the 'student' numbers changes from this perspective (if it was an issue, presumably some/many of the students or former students could enter into such marriages).
Anyway my short point: at least one of the articles lists other countries that are also an issue. I mention this because it's important to keep in mind: India represents a fairly large percentage of Canadian immigration. For this reason, issues with Indian applications will occupy a more central part of government thinking about risks to the immigration system as a whole, in a way that issues with applications from eg Botswana will not (Botswana probably not even in top 25 source countries). It shouldn't be over-interpreted; the truth is that it's to some degree just a question of numbers. And of course it's also a fact that there is more economic incentive from relatively poorer countries to find some way around the rules like sham marriages - India is not at all unique in that respect, again, numbers.
There is a related issue that arranged marriages are more common in India (and Pakistan and some other countries). That makes those marriages a bit harder to evaluate in terms of 'genuineness' (compared to say typical relationships in Canada where living together for sometime before marriage is common). That's why there is more emphasis for applicants with such marriages on fully respecting the local and appropriate customs as well as any inconsistencies in files that indicate something out of ordinary. There will always be some tension/contradiction because of that.
Personally I attach very little significance to that estimate of 'up to' [some number] possibly being sham marriages. Clearly there was an estimate with a range, and if that number was eg from 5% to 30% (completely made up number by me), that would look very different.