it sounds to me a derivative of what i call "slowboat" cooking.
I'm not so sure about that Jerry. This is, quite specifically, using a base, which has lots of oil, with no additional oil being used for the main dish, and reducing an initial amount of the base (about 200ml, with the spice mix added),
very significantly, before adding any more base, or other ingredients. The oil from the base appears to caramelise the initial ingredients and cooks the spices (as Josh says).
Other than that, tha technique is pretty quick (about 10 minutes, or so, to a final curry)...so not "slow boat" at all (albeit, not fierce heat either).