On Mon, Apr 27, 2020 at 04:23:20PM -0700, Gao wrote:
# cat delete_acl.ldif dn: olcDatabase={2}hdb,cn=config
changetype: modify delete: olcAccess olcAccess: {0} olcAccess: {1}
Is the blank line actually part of it? Then you're making a no-op change on that entry, plus submitting some invalid stuff (which gets ignored) afterwards.
Delete the blank line and it ought to work.