Regardless of what happens with this bill, these situations don't change until this bill is enacted. If this bill is not enacted, it will stay the same. So, the Four Seasons and the CZ 858s would remain non-restricted, and the amnesty order would be in place with regard to the other Four Seasons firearms that are not non-restricted, but are, in fact, prohibited.
The date that is set out in the legislation doesn't affect the legal classification of any of these firearms. It just gives notice to firearms owners to give them time to decide whether they want to be grandfathered or whether they want to dispose of the firearms. If the bill doesn't come into force and is not enacted, then that date is just meaningless.