Federal and state laws require that weekly benefits (UI and PUA) be reduced by the amount of retirement benefits someone receives (other than Social Security) if the benefits are from a program that is paid into by an employer the person worked for in their base year. So it is not categorical and requires a case by case review.
For example, if someone is getting PERS benefits, and works for any employer that contributes to PERS during their base year, then the retirement amount does reduce, and in many cases eliminate, their weekly benefits. If they are getting PERS retirement benefits but did not work during their base year for any employer that contributes to PERS, then the retirement income does not impact their weekly benefit eligibility.
You can find more information at https://www.oregon.gov/employ/... under the “How does retirement pay affect my benefits” question.