Either the webpage is incorrect or uses a non-obvious formula to calculate inclusive costs (Data Retrieval, Data scanned, API charges along with Data storage)?
Re: Storage: Deep Archive's ~$0.001 per GiB whilst IA buckets are ~$0.01; a 10x difference.
API charges for data retrieval from Deep Archive is 100x (?) (~$0.1004 per thousand reqs) expensive than IA buckets ($0.001).
Data retrieval for Deep Archive is 2x ($0.02 per GiB) the cost of IA ($0.01).
5TB in ap-southeast-1 is what I plugged in.