Hi, @Matei. There has only been one version of that site deployed to Netlify so it is impossible for this to be a CDN caching issue. There has never been a previous version of the site served by Netlify so it is impossible for us to have a previous version cached. We cannot cache something that never existed in the first place.
I believe what you are seeing is caching of DNS records in downstream DNS resolvers. That is not something Netlify can control nor can we purge those caches. There is a support guide with more information about this below: