That doesn't explain how locomotive engineers are allowed to keep engineer in their title? Given 1 literally states ` uses the title “engineer” or an abbreviation of that title in a manner that will lead to the belief that the person may engage in the practice of professional engineering;` it all seems like bullying from the org trying to lay claim to Engineer so they can collect more dues when "Professional Engineer" vs "Engineer" is enough of a distinction.

also 4 is directly relating to training certs for a "systems engineer" not job titles which does make some sense, microsoft still seems to use the title "software engineer" in canada for jobs

(1-3 are not what i would consider unbiased sources)