But ... the video isn't for a general audience. He doesn't have any reason to apologize to a general audience. His customers are the only people that matter in this situation and this video is for them.

Honestly, nobody lost their lives, the impact is pretty much limited to OVH (who need to find a new building), their customers (who need to find new servers and restore backups), and the city of strasbourg (who run the emergency services and presumably will have some involvement in the cleanup). While we're all interested in a "Oh, are we prepared if that happened to our provider?" sense, I don't see why OVH is obliged to provide communications to us, rather than to their customers.

I would expect the communication to be directly targeted to customers not the general public.