Not the first time i've read this. Reading these comments from years ago kind of makes one smile. How surprising is it that a lot of what he reports is now "nothing new", but how many people have taken it on board? Hasn't the forum discussed whole onions, use of fruit / veg for tenderising lamb, old oil, mature curry gravy etc etc? At the time Ghanna commented, it probably wasn't given the recognition it deserved.
As for the yoghurt in the base, not so sure about that. Possibly a condiment to add a layer of flavour to some dishes. I do know one of my locals adds "cream" to their base. Whether they mean cream, evaporated milk or coconut cream i'm not so sure. I fancy it could be carnation, just like in the little india base which is the next base for me to try.