Media reports on that number:
https://www.google.com/search?sourceid=chrome-psyapi2&ion=1&espv=2&ie=UTF-8&q=filial%20appeal%20to%20pope%20francis%20800%2C000&oq=filial%20appeal%20to%20pope%20francis%20800%2C000&aqs=chrome..69i57.12303j0j4

As far as "rad-trads". This isn't a "rad-trad" issue. It's an issue of intellectual honesty and having some semblance of credibility when the Church claims that we don't change doctrine. It's the fact that one pope has published an Apostolic Exhortation which essentially contradicts a key portion of one his predecessors Apostolic Exhortations (Amoris Laetitia Ch 8 vs Familiaris Consortio 84). All the defenders of Francis have tried to dance around it but it's obvious: one Exhortation or the other is true but they both can't be because they are in contradiction. It's not a development it's a CONTRADICTION.

Look if you don't think the Church infallibly teaches the doctrine of Jesus Christ in every age, fine, this isn't really an issue. Otherwise it is