The true point of being a professional engineer is that you've satisfied the MINIMUM requirements to be licensed and, therefore, you are licensed by the state to sign off on documents within what you consider your expertise. It relies on you to make that determination with the understanding that you should know better, recognizing the legal and professional ramifications if you practice outside your expertise.
I disagree with the Oregon ruling: holding yourself out as an engineer without licensure is not acceptable and should not be encouraged. It creates confusion amongst the public about what a licensed engineer is and who to trust.
The guy could have easily put out his findings as an interested party or something without trying to invoke the goodwill that people like you and I have put so much effort into engendering.