That is because there is this thing called Google scholar, which is an important tool for the academic who doesn't bother to update their CV.
https://scholar.google.com/citations?hl=en&user=uAJ515sAAAAJ&view_op=list_works&sortby=pubdate
The ESL at Stellenbosch also dabbles in Machine Vision
http://staff.ee.sun.ac.za/cvdaalen/index.php/research/
Actually, an academic who doesn't even try make their research available online (or even list that it exists on their academic page) is almost certainly not an active researcher. The Google Scholar results you list support this (very low citation counts, especially for first author titles). 5 citations since 2013? Basically, retirement.
The second person you mention is also barely doing research according to Google Scholar.
I'm not really sure what your point is, but you appear to support mine.
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