Website’s still offering 16.0.3…
It was updated 4 days ago: https://github.com/nextcloud/nextcloud.com/pull/1149
It there are still old links at other places, please report it to the same repository.
It can take a bit of time to push the update to all the Nextcloud instances (via updater app), they are not offered all at the same time to save resources. I’d guess it should happen within a week or so.