Good find! If you rewrote this part of the encyclical in bullet list form, edited out the condemnations, and began it with “We demand,” you’d be very popular among progressive Catholics!
There’s more where that came from! “The Popes Against Modern Errors” 16 Papal Documents from Gregory XVI, Pius IX, Leo XIII, St. Pius X, Piux XI, and Pius XII. Published by Tan Books.
Another huge little factoid: Pope St. Pius X required all clergy, professors, and anyone in positions of authority to take the “Oath Against Modernism.” Pope Paul VI dispensed with it. Surprise, surprise... not!