As mentioned in the pervious thread, this topic is really hard to discuss without knowing the specific details of the flag. Such details are not appropriate to share here on the forum per the forum guidelines.
Curators are people and volunteers, and thus can make mistakes. If you truly believe that the curator’s actions were unjust and unreasonable, you can submit a help ticket and have iNat staff assess the situation. But ultimately, it’s their (staff’s) platform and they get to decide what content is and is not allowed. Again, the forum is not the place to share specific details about the flag. As far as censorship goes, freedom of speech is not the same as freedom of platform (meaning you can say what you want, but people aren’t obligated to allow you to use their platform to do so).
Today I flagged an observation (not yours) where the subject was a human that was very obviously trying to avoid having their picture taken. Curators rightly removed the photo. A fair amount of discussion has been provided about this topic in this thread: Human obs used for cyberbullying.