Value of light-to-none peer reviewed pay-to-publish articles
From your description, it sounds like the problem is more likely to have been the MSc supervior than the student.  As evidenced by some of the questions we've seen here, it's very hard for people new to academia to figure out which venues are reputable on their own---and the advice we give usually includes talking to someone in academia.  If the supervisor's name is on the publication, that presumably means the supervisor encouraged publication in these venues.

Especially if it's a journal which does a small amount of peer review, I wouldn't assume, without further evidence, that the student has any idea that the papers weren't fully peer reviewed.  If the supervisor isn't active in the international research community, I'm not sure I'd even assume the supervisor knows that.