Agreed; however, my intention wasn't to focus on the low cost and sophistication of the Argentine submarines compared with ours. Rather, it was to draw attention to their effectiveness in tying down our assets, forcing us to consume valuable resources and limiting our options. From that point of view, they were very successful indeed.
Of course our SSNs did the same, arguably to an even greater extent, to the Argentine Navy. After the sinking of Belgrano, the UK SSN threat was clear and they had no effective counter to it. Consequently, the Argentine carrier task group could no longer be risked at sea.