Hello,
Since OpenLDAP 2.3/2.4 there is a new method to configure openldap named cn=config https://www.openldap.org/doc/admin24/slapdconf2.html, and the old one based on slapd.conf seems to not be used anymore (at least on Debian with 2.4).
The code seems to manage the old-style configuration but I'm not sure about the new one: is the formula able to manage it?