The schedules, schedule 1 and schedule 2, are not connected in any way to the proposed amendment you were referring to earlier about centrefire semi-automatic rifles. They operate completely independently. The firearms listed in schedule 1 are the firearms that are already prohibited, either in the 1990s or in 2020. In schedule 2, it's firearms that the government has proposed become prohibited if the bill passes. Those lists are curated. They are produced manually.
On December 1st, 2022. See this statement in context.