Things that have been stated in Miraculous Ladybug:
Andre Bourgeois has the funds, technology, and clearance to launch Paris’ trash into space, thought that was a good idea, and somehow hasn’t been assassinated by NASA, the ESA, and the ISRO for creating this Kessler-Syndrome-waiting-to-happen.
Plagg is the reason dinosaurs went extinct, meaning not only are the Miraculous at least sixty-five million years old, not only is he personally at least sixty-five million years old, but someone was using Miraculouses during the time of the dinosaurs! (Does this show share a universe with Kyōryū Sentai Zyuranger?)
Things the show runners have said about Miraculous Ladybug:
Ladybug and Chat Noir have patrols, in spite of the fact that all akumatized villains will find a way to make themselves known.
There is no glamor protecting their identities, in spite of that being literally the only possible reason no one’s figured it out yet.
Thomas Astruc can’t tell me what is and isn’t canon.