French anon here, it can't be an accident. The question is what is the purpose behind it. I would be curious to see ND after the renovation, quite sure we will see some satanic symbols added, not visible for the people but notable for the initiated eyes.
Macron did not lose one minute to use the event to ask for the people to unite behind him. This reminds me the FF in US to control the narrative and manipulate people.
I've lise en few minutes to Macron's speach, he looked like a student trying to recite a text learnt by heart.