Glad to be of some help!
The general consensus among OpenBSD Project members (and astute users) is to be very wary of third party guides. You can read them, but always verify their guidance, as it may be out-of-date, incorrect, or misleading.
In this case, the guidance you followed was 4 years out-of-date.
- The rc.conf(5) provisioning subsystem changed from sourced to parsed in 2014, and that is the year that the *_enable flags went away.
- The system-wide D-bus changed its name to messagebus in 2015.