No it is not necessarily. For example forcing to have a chronical timeline on followers would be strong social media regulation but no censorship even in the broadest terms.
If I'm unable to publish something that I otherwise would, that is de facto censorship.
Your example is not a dismiss of my argumentation.
It's not a dismissal, it's a refutation.
how?
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The question isn't if some censorship is good or bad. The question is if media regulation is censorship, and the answer is yes.
If you want to say "Enforcing regulation equals censorship", that is fine by me. For many, there could be a difference between them, as they reserve censorship to unjust regulation.
That would be a matter of linguistics, and I can't say which of both definitions is true.