Wow. There's literally legislation intended to have a chilling effect on certain kinds of speech - outlawing it - and you "don't think it's censorship" because you happen to disagree with said speech. It would be difficult to conjure a more prototypical example of censorship.
It's definitely censorship, just in the same way that a police department might also have rules about officers not swearing at children. Yes it restricts speech, but no, it's not inappropriate or stifling of discussion.
A more prototypical example of censorship would be government-sanctioned banning of the selling or distribution of books critical of its policies... and not just in libraries at schools for children.
You probably saw the video of Russian protesters being taken away by henchmen immediately after speaking out [1], or the video of the Chinese police interrogation for the guy who criticized them on WeChat [2]. It'd be a little obtuse to compare these to controlling what sexual education topics kindergarteners are exposed to.
I concede that your examples are more prototypical examples of censorship. That said, a law banning what teachers can or can't teach is also censorship. While it's not appropriate for teachers to teach to kindergarteners about sexual identity topics, it really shouldn't be lawmakers making those decisions (what schools should or shouldn't teach).
