Phil, you can see from the video that his 1 curry spoon (ie; Chef's spoon) is well rounded if not close to heaping, but it doesn't matter at all how much it holds. The exact amount is not critical, but we get the
approximate ratio being 2 : 1 : 1 for Turmeric : Coriander: Cumin and then a small amount each of the minors, being Garam Masala and RCP or Paprika (approximately 36 : 1 for Turmeric : each minor). It doesn't need to be measured to the grain.
We don't really need to go down the how many tablespoons in a Chef's spoon path again. I have 3 Chef's spoons and they each hold a different volume of water. The UK / Canadian TBSP (15 ml) is different to the US TBSP (14.8 ml or 0.5 Fl oz) is different to the Australian TBSP 20 ml etc etc. It doesn't matter a bit. The volume is not relevant. It is the ratios and they aren't critical.

The Tablespoon units is probably just to make the whole presentation more fuss proof for the pedantic punters of the world. He's probably watched Latif's videos and seen the flack he copped from being a bit loose with the measurement side of things using serving bowls to measure cups.
