Not really. There's a non-pedantic, charitable interpretation widely available. It's below for reference.
> Navier-Stokes is one of six [open] “Millennium Problems” on a list compiled by the Clay Mathematics Institute in 2000.
If solved problems don’t count anymore, the sentence also doesn’t make sense because now navier stokes apparently isn’t open anymore too, right?
If solved problems don’t count anymore, the sentence also doesn’t make sense because now navier stokes apparently isn’t open anymore too, right?