You’re looking at the original article. This whole series of comments has been spawned off a discussion about a different case, in which the person did join the organization, then let his license lapse.
In the original, I agree. He never required a license because of their own regs( though it appears that also means he couldn’t call himself a professional engineer, so the title itself is protected, he was just exempt from needing the license to do the industrial work he was doing). He is then totally within his rights to use that knowledge and pass himself off as a subject matter expert in the same field he worked for X years, and the board just got pissy. Glad it was overturned for him.