You installed these packages using the multilib repository (anything lib32-… lives in there, and a few other packages). Now, for whatever reason, the multilib repository is no longer available. Maybe you deactivated it in your pacman configuration, or you just had issues downloading the latest package database. paru no longer finds them in the official repositories, and it also does not find them in the AUR, so it displays that message. After you have updated/reenabled the multilib repository, this message will disappear.
You can list the packages that were previously installed as a dependency for another package but are no longer required using pacman -Qdt. It should be safe to remove all of them. (Some of them might only be required to build another package from the AUR, not to use it. But those will automatically get reinstalled the next time you update/install that package using paru).
You can automatically remove all obsolete dependencies when uninstalling a package using pacman -Rns . For example, pacman -Rns wine would have likely uninstalled the lib32-… packages for you automatically (assuming no other package depends on them).