This is what I think is obvious. If a company is legally registered, it is regulated simply by Costa Rica law.
No, it is not. There are no laws or regulations for online gambling in Costa Rica. As there is no legislation regarding gambling activities, there is no one to control or regulate online gambling companies. Therefore, this is an unregulated casino and there is no legal protection for players.
Unfortunately, I don't know how to check it, so I'll assume you're right.
However, if the casino is registered and operating legally, it is better that it offers some level of security than a fully anonymous gambling platform that gives nothing.