You're splitting hairs... if you can be sanctioned for something, it's a rule. Call it a "series of beliefs", "code of conduct", "law", "suggestion", whatthefucckever, if you pay a penalty for breaking it, it has the effect of a RULE, period.
I'm not splitting hairs...I'm explaining to you that there IS a difference...a BIG ONE>
The RULES clearly state that you cannot compete for a rival federation, or you WILL be suspended. This particular rule has been enforced 100% of the time, without exception.
The code of Conduct SUGGESTS that you refrain from certain activity, porno, talking trash about the judging, other athletes, etc....and has been enforced by way of warnings, letters of apology, etc...a HANDFUL of times...