This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule.
If another state decides to leave the Interstate Compact for Adult Offender Supervision, that doesn't mean Oregon loses all ability to work with that state. This compact is an agreement between states that allows people on probation or parole to be supervised even when they move across state lines.
When a state withdraws from the compact, Oregon's Department of Corrections can still make a separate deal directly with that state. This backup agreement lets Oregon keep doing the same basic job: supervising offenders who move between Oregon and that other state, or handling cases where offenders from that state need supervision in Oregon.
In short, this rule gives Oregon a way to keep supervision arrangements working even if the normal multi-state compact breaks down with a particular state. It protects the system so that offender supervision doesn't stop just because one state decides to exit the larger agreement.