Still not undestanding you.
Again, you are saying the CBI takes in 1 million and gives out 1 million, which by any math standard known to man, is a wash. No reduction.
Are you thinking the million 25K notes being destroyed are removed from circulation?
Yes that is true. BUT… the million small denoms they gave the bank is new to circulation.
Currency owned by the Central Bank is not in circulation.
Some banks may have deposits held at the Central Bank, but that’s money owned by those banks. The CBI can’t give that money away. If they did, they would have to replace it.