Phil
I have looked at the vid against the book albeit briefly. Ww already know about anomalies however important examples lie around -
Differing quantities in vid to book
Differing quantities ratios between 15, 7 and 3 litre bases and again when reducing the 3 different bases he explains.
That said, the video is using a 7 litre PC . Now, is that a 7 litre or a 3 litre?

He describes a 7 l elsewhere in the book and uses the same one in another vid. It is the same one I have and is deffo 7 litre but I have to agree that the one you refer to looks a bit smaller or is that the way the vid was done? Remember the high sided pans?

The quantities he describes therein are for a 7 litre Bangla base as per book. Eg 500 ml oil. Whole bunch coriander etc.
The book does say transfer base to larger pot and double volume with water. He does not mention this in vid, it just appears in the new pot.
Big further discrepancy for me between vid and book is in the vid he doubles with water and blends then adds spices before next cook. In the book the spices are added before the water and before blending and cooked 30 mins. He does say transfer to 15l pot which is clearly the second one in the video.
Not sure any of this helps re the quantity issue but having made this several times and to repeat -
I use a 7 litre pot but only fill to a tad over half. After boil and spices cooked i add water to around the 6 litre mark . My pan is graduated. After blending and last boil I normally have to add another .25 to .5 litre water to get the constancy right following some reduction. So, I produce 6 litres or a little over from a tad over 3 litres ( spacial ) of starting ingredients raw in the pan. At least Julian clearly shows the desired consistency in the vid! Something very helpful and which cannot be described in a book ( like the 'smell' ).
Hope this makes sense. Not at my best at this time of the day. Must end though by saying that the vid and book are far better read / watched in conjunction with each other.