I mean, that’s how I read it, too. It’s going to be the default for any urban area, cities of millions, towns of dozens.
But that doesn’t stop rural towns from increasing the speed limit by posting a 50kph sign, either where it is reasonable, or overall. When you enter any town/city-limits by car, you need to slow down to 30kph, unless there is a speed sign allowing for higher or lower speeds.
This is literally all a town needs to say “the 30kph limit is nice, but we don’t want that”:
I mean, that’s how I read it, too. It’s going to be the default for any urban area, cities of millions, towns of dozens.

But that doesn’t stop rural towns from increasing the speed limit by posting a 50kph sign, either where it is reasonable, or overall. When you enter any town/city-limits by car, you need to slow down to 30kph, unless there is a speed sign allowing for higher or lower speeds.
This is literally all a town needs to say “the 30kph limit is nice, but we don’t want that”: