Yes that's correct. I work at VS
and last week it was expected that overflights would be allowed, however a couple of our flights from Africa to the UK had to be routed to avoid French airspace when it was closed at the last minute. Fortunately the a/c involved had enough fuel and didn't require a tech stop.
Regardless of who's fault it is, it's the airlines and passengers that suffer so I hope they hurry up and sort it out.