It's a mistake to pick out individual phrases and treat them as if they were mathematical equalities. Look at the preamble to that section:
'As used in ORS 672.002 (Definitions for ORS 672.002 to 672.325) to 672.325 (Civil penalties), unless the context requires otherwise:'
It's terrifying because you are reading bits of it out of context and extrapolating incorrectly to the broadest scope imaginable. I perform some of the activities on this list on almost a daily basis just in the normal course of making things and being an artist (the old-fashioned variety slapping paint on canvas). I have exactly zero fear of ever being prosecuted for unlicensed engineering activities.
How you should be reading it: ORS 672.005 described things that an engineer does as part of their work. Then you go on to look at ORS 672.007 which talks about how
(1) A *person* is practicing or offering to practice engineering if the person:
(a) By verbal claim, sign, advertisement, letterhead, card or in any other way implies that the person is or purports to be a registered professional engineer;
(b) Through the use of some other title implies that the person is an engineer or a registered professional engineer; or
(c) Purports to be able to perform, or who does perform, any service or work that is defined by ORS 672.005 (Additional definitions) as the practice of engineering.
https://www.oregonlaws.org/ors/672.007You are not going to get fined just for calculating the hypotenuse of a triangle in public. In programming terms, you're worrying about the value of a variable without considering its scope.
Forgot to mention that all emphases are added by me.