Achmal, you are right. There is a difference in that, as you have explained, the Taz method involves reducing to a great degree, rather than an all-in-one boil down.
I have tried the Taz method and I would definitely recommend it for newbies/beginners because it's almost impossible to burn the spices...and you can apply it to any recipe, not just Taz's.
I still maintain though that it is second class curry compared to frying of the spices/gg paste/ tom paste at the start.
I have tried both ways and the Taz method, at least in my experience, produces a more subdued effect from the spices.
I would not hesitate though to recommend the Taz method as the first one you try if you are new to BIR cooking...or cooking in general.