This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule.
The Oregon Department of Corrections has to work on growing and creating treatment programs for people struggling with alcohol and drug addiction. These programs need to meet quality standards set by the Oregon Health Authority. This means the department can't just ignore addiction treatment. It has a real responsibility to offer these services to people in the corrections system.
There's an important catch built into this rule. The department only has to do this "to the extent that funds are available." This means the state isn't required to spend money it doesn't have. If the budget is tight, the department can scale back on expanding these programs. In practice, this gives the department some flexibility, but it also means that the amount and quality of addiction treatment available can depend heavily on how much money the state decides to invest in it each year.