Ah nice to know! In my defense I only searched for the English version.

That being said, Robespierre was a key participant of 'La Terreur' where tens of thousands of people where hastily judged and executed and he himself ended up executed 4 months after that speech. [1]

[1] https://fr.wikisource.org/wiki/Discours_lors_de_la_s%C3%A9an... (French version)

Indeed. "Nothing to hide, nothing to fear" has always contained implicit threat.