Orientation: All SCUBA divers must attend an orientation with their dive operator (the center from which air tanks are obtained) before diving in the BNMP. The orientation consists of a dry part and a wet part. The dry part is a briefing on the Bonaire National Marine Park rules. The wet part of the orientation is the check out dive, which is always supervised by the dive operation providing air. Repeat divers are required to attend a dive orientation and perform a check out dive every time they are back on island.
Returning divers are supposed to repeat the process, if you skip it you're violating STINAPA's rules, you're not taking advantage of a loop hole. Even if it was a loophole, at least within the last year you'd have demonstrated you know how to dive, that's a better baseline than nothing at all.
Rules were obviously made to be broken, pointing out broken rules in Bonaire is fun, however I don't know what it would have to do with Cozumel. They would be free to adopt their own specifics to the guidelines/rules if they implemented a required check out dive, the details, enforcement etc would be up to them. Bonaire's enforcement and implementations are only an example of their enforcement and implementations, it doesn't mean another country is required to duplicate their weaknesses.