I made this base yesterday, using replicated measurements from the video

. I did it a day before the Tomato puree video emerged so that part is my own best guess.
This is not a "neutral" base. As the chef says a few times, it is a flavoursome base gravy. It is strongly spiced in comparison to any other base I've used and the addition of chilli is very noticeable. I can easily agree with it being used for a Madras, Vindaloo or a RJ, but for me anyway, it is too spicy for extra mild curry like korma. I certainly would not use it for Mango Chicken.
I'll make a dish or two today using it. I expect them to be nice and very well spiced.