So it would seem Santa! He does add in a fresh green chilli after the "base chicken masala" has been completed and presented for what it is. The halved cherry tomatoes in the completed dish are also obviously added after the initial base preparation plus a garnish of coriander leaves. I would still be surprised if it was a fantastic curry on it's own. I guess there's only one way to find out for myself.
Romain has already pointed out the time it would take to prepare this dish would be quite long, so it is unlikely to be a demonstration of how finished curry dishes are prepared for service in the restaurant. If it is used as a preparatory base method and extended into actual dishes then it may well be another method. Standard BIR Base Gravy methodology is not the only way of preparing restaurant or T/A dishes.
I would say it is possible to use this 'base chicken masala' to create dishes like Dopiaza, Jalfrezi, definately Madras and Butter Chicken and even Chicken Rogan Josh. Not too sure about a Korma or Pasanda though. It will not be able to be used to create Britain's favourite dish, a Chicken Tikka Masala simply because it hasn't used Chicken Tikka, if that is a criteria.
Tomato powder is nothing more or less than a concentrated tomato flavour boost. Depending upon where it's made, and out of which type of tomato, the flavour intensity may well vary. Triple concentrate paste would serve equally. I think the main benefit of powder and the reason for it's use in the industry is for storage and longevity. The same applies for the ginger powder. He could simply use additional fresh ginger. When I first went out and stocked up on spices for my Curry adventure I bought every spice and powder imaginable, including dried ginger and ground ginger powder. I've never used either really, along with many of the other less common spices taking up space in my cupboard.
Have you ever tried to do anything with lumps of dried ginger? Apart from taste it has similar physical properties to gravel.