John Anderson will not be telling CASA to make the changes they are making. That is not how government works. Anderson will not be involved in the micro detail of any of the CASA proposals. He will have asked for regulatory reform and parts 119 and 121B will be what CASA dishes up to him as regulatory reform.
A minister will receive advice from his bureaucrats - that is what they are there for - in this case CASA. CASA will tell the minister that their proposed 119 and 121B are the way to go.
Anderson (or any other MInister) will accept their advice if he does not have conflicting advice from industry or the community.
If you want Anderson to reject CASAs advice re the new 119 and 121B and tell them to go back to the drawing board, you must let him know that they won't work and won't be acceptable to the industry or the community.
The Minister needs to receive alternative advice - in the form of rational and well argued industry and community opposition to the proposals in order to reject them.
For those concerned about the proposals, your challenge is to show the Minister that this is a significant political issue and he should reject the (bad) advice from his department.