He is an engineer. But he didn't say he's a registered/ unregistered / official/ unofficial/ practicing / not practicing / civil / electrical / software / science / industrial / computer / oregon / out of state engineer.
Also, if "declaring yourself an engineer is a violation of the regulations in most states", engineer visitors are surely fined and kicked out when they have to answer "what are you working as?" at the boundary gate.
This is just another stupid case. Whoever has more money will win this.
The relevant statute in Oregon is listed below. Simply by verbal claim implying you are a registered profession engineer, you appear to be violating the statute...
672.007 Acts constituting practice of engineering, land surveying or photogrammetric mapping. For purposes of ORS 672.002 to 672.325:
(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 as the practice of engineering.
Back in my youth (about 30 years ago), one day the company I worked for made all of us change our business cards from "engineer" to "technician" because of these laws. My dad (a civil engineer) somehow convinced me to take the FE/EIT and prep for the PE exam even though my job didn't require it because in his world I got my degree in engineering and well dammit, he wanted to call his son an engineer.
FWIW that whole licencing experience was bunk for computer engineering. At the time, the exam for electronic engineering specialty wasn't up to date at all (mostly 3-phase power, pentode amplifier questions) and completely irrelevant for computer engineering (except for a couple Fortran programming questions). Of course the exams are more updated now and include computer engineering, but I suspect they are still not remotely "current".
To top things off, even after I "passed" the FE/EIT, I then discovered that my university was unaccredited** and the "pass" was actually a conditional pass which required me apprenticing for 6 years before being allowed to call myself an Engineer in Training and to sit for the PE exam. Since nobody in my company was a licensed engineer that certainly wasn't gonna happen. So I immediately dropped that whole idea of becoming a professional engineer just to put it on my business card and never looked back. I just call myself a computer architect (to the horror of my father) and that's that...
**I didn't graduate from a diploma mill, I graduated from a student mill (called Caltech) which is sorta accredited, but apparently not accredited enough for ABET ...