I know many forum member have put their heart and soul into getting behind the scenes, being shown how to cook by BIR chefs. They have been shown how to make mix powder but you can bet it's not the mix powder they would use.
I'm sure you're right and, to a large extent, many people have been duped. H4C may be another victim but perhaps we'll never know. Why would a good restaurant give away its commercial secrets?
Now I'm having some success, with dhansak primarily, I can start to assess what's been left out of earlier recipes - a few of which have been highly rated by other people - but none of which delivered the type of flavours produced by the best BIRs, when I tried them.
Yes, the mix powder is important but so are a lot of other elements. They all have to be right, in my opinion. I feel the final dish will only be as good as the weakest link.
I edited the text I quoted and made about a dozen changes. Your English is too good for you to make that many mistakes by accident, so I think it must be deliberate, like the messy use of lower and upper case lettering in your user name. Why have lower case H for your second name?