Yes, I'm confused by things too. Here is my current data for my most recent server around block number 20475678. I was very careful to follow the script with this server.

du -sh _data/steem/
440G    _data/steem/

ls -lh _data/steem/ | egrep '[0-9]G'
total 440G
-rw-r-----. 1 polkitd ssh_keys 263G Mar  7 20:04 sbds_core_blocks.ibd
-rw-r-----. 1 polkitd ssh_keys 1.7G Mar  7 20:04 sbds_tx_claim_reward_balances.ibd
-rw-r-----. 1 polkitd ssh_keys  82G Mar  7 20:04 sbds_tx_comments.ibd
-rw-r-----. 1 polkitd ssh_keys  28G Mar  7 20:04 sbds_tx_custom_jsons.ibd
-rw-r-----. 1 polkitd ssh_keys 3.0G Mar  7 20:04 sbds_tx_transfers.ibd
-rw-r-----. 1 polkitd ssh_keys  61G Mar  7 20:04 sbds_tx_votes.ibd

Note: I tried comparing this server with the other server I have running sbds to see if I could identify why one was bigger than the other, and I notice that the data contained in the 'raw' field in the 'sbds_core_blocks' table doesn't seem to match on both servers. For example, the 'raw' field for 'block_num' 20470001 on one server is different than the same raw field on the other server.