what exactly makes it not BIR? You've said it isn't BIR. Why is it not?
It's not ... because of the quantity made and the time taken. A true BIR curry, as exemplified in this forum, is a single portion dish able to be cooked in five to ten minutes. Just as in a BIR or takeaway on a busy night. BIR is a term introduced on this forum in its early days and now liberally abused by various Youtube patrons.
Of course, technically, anything cooked in a BIR is a BIR dish but for the aforementioned reason ... not always!
P.S. I just noticed your point about the use of raw chicken. The only time you'll see raw chicken being used in a BIR is for a staff curry, like in this one. In all BIR curries it will be precooked meat as a time saving and hygiene factor, so that would be another reason for this not being what we know as BIR.