Very good question SC Adams.

That Section of Constitution was created by Ballot Measure 8 which the voters passed in 1994.

However, even though that measure was a constitutional amendment, the Oregon Supreme later threw the change out. They ruled that langauge violated the US Constitution's contract clause.

So even though it's in Oregon's Constitution, it's not enforceable.

The situation is explained, briefly, here, under the 1990s section:

https://www.oregon.gov/pers/section/general_information/history_8_6_2012.pdf