It's clear what neoCatholics fear the most, simultaneously betraying their own progressive bent.....they are the conservative public relations front for the Modernists...Kung was just 10 years ahead of the plan on the Modernist agenda.
It makes perfect sense.
"The whole modern world has divided itself into Conservatives and Progressives. The business of Progressives is to go on making mistakes. The business of the Conservatives is to prevent the mistakes from being corrected." -GK Chesterton
If Extra Ecclesiam Nulla Salus, that is very baaaaadddd news for the SSPX schismatics who are excommunicated and therefore Extra Ecclesiam.