It is not my job to interpret this aspect of the role of the Parliamentary Budget Officer. As members, you may always ask the Library of Parliament Parliamentary Information and Research Service to provide you with an approximate cost assessment of any bill. This service is already available to you up to a certain point.
This bill contains a royal recommendation. As a result, the government has the power to introduce a bill appropriating public funds. Sometimes, the expenditures associated with a bill are quite clear: the number of agencies that will be created, the staff required, salaries, etc. Sometimes, it is extremely complex, and given the delays that are inherent in government operations, the full amount of expenditures associated with passing the bill will not be known until latter stages of the process. Sometimes, these expenditures are not known until the government tables in the House the budgetary estimates associated with a bill that has already been passed.
I have noted in this bill that for private members' business, a member or a committee could request a cost assessment. Generally speaking, MPs do not have the authority to introduce bills for the appropriation of public funds.