No, unfortunately it’s impossible to fix ALL of them. We WILL clean up all the citations that matter the most though. When we started doing this work, we attempted to do "all" the cleanup and we soon realized that it's impossible. Many of the citations we find are going to be on sites that nobody manages. These sites likely bought or scraped a list of business data, populated a database, and put up a business listing website. Now the site is completely abandoned. There is no option to edit the listings and no response to emails. There is no way to change citations on sites like this.
The good news is that incorrect citations on these sites aren't going to hurt you. The sites are inactive and Google largely ignores them. They don't have a strong enough signal to mess with your NAP consistency and affect your listing with Google. When we do your citation cleanup work, we work with our list of sites that have the biggest impact on your local search, and carefully review each site in your audit to assess if it's worth a cleanup attempt or not.