What's the reason for this change? Unfortunately, the Bill doesn't say. The explanatory note simply says that the amendment is to "remove redundant references, insert an updated reference to the State Services Commission, and update spelling in 5 items." But the Māori Trustee hasn't been disestablished, and it does not appear to have changed into another form of entity already covered by another part of the Act, so it doesn't seem to be redundant. Perhaps the government feels it is inappropriate for the Trustee to remain subject to the Act. But if so, firstly, they need to make the case, and secondly, that doesn't seem to meet the "technical, short and non-controversial" requirement for inclusion in a Statutes Amendment Bill.
I've sent in an OIA request to Andrew Little, who (under the usual approval process had to sign off on this amendment). Hopefully that will provide a justification for this change. If none is forthcoming, or it is simply a desire on the part of the Trustee for more secrecy, then I will be seeking an MP to object to the clause at the Committee Stage, which would see it removed from the bill.