Now this is very confusing. It was pointed out to me by another editor that the road closures are now appearing, but about 10 hours late, and I can see them in livemap from the finish, going 3/4 of the way round back to the start.
Maybe it needs the lack of traffic on the roads to kick in??
It will be interesting to see if the closure are removed at the listed times. If not, then I suspect a time zone conversion snafu.
Shall keep monitoring.
Update @12:40: Closures appear to be removed at the correct time, from what I can see from livemap.
Update @20:30: All closures have been removed. Looks as if it was just a late implementation, as the “Avoid traffic from the cycle tour” notification was only sent at 09:46, by which time the elite group, who left at 06:15 and took just over 2 and a half hours to complete the 109 km route had long since finished.
Many thanks to all at Waze Support involved. This process can only get better.