In fact, if you read that article more carefully, you'll find you're not reading the relevant part of that article. The Kola Superdeep Borehole set two records

In fact, if you read that article more carefully, you'll find you're not reading the relevant part of that article. The Kola Superdeep Borehole set two records: deepest point reached, and longest borehole. The latter record was, as you say, surpassed twice by oil operations. But if you look at the context of the comment I was replying to, it's clear that Dr Stalker was talking about deepest point reached (surely no one thinks Cameron could dig a multiple-kilometer hole from his submarine). And so it is the deepest-point-reached record that is relevant, which was not surpassed by oil operations. This is because those oil boreholes are diagonal, with a large horizontal component. Also, based on the information I could find, I don't actually know how deep the KSB is, relative to sea level, because I don't know what altitude its "ground level" is, and all the depth measurements I could find are relative to ground level.