Hi Vivek,
That is incorrect, there are more than 160 IPv4 prefixes (I haven't checked v6 yet) which are marked as either "reserved" or "available" in the APNIC delegation file and they don't exist in AS-0 ROA. So there must be some policy which is in place.
delegate file: 2.3|apnic|20220830|158240||20220829|+1000
AS0 ROA: SigningTime: 2022-08-30T01:10:15Z
Regards,
Aftab A. Siddiqui