I have read this. But neither Francesca Bria nor any of the claimed supporters (Friedrich Ebert Stiftung, Rosa-Luxemburg-Stiftung, etc.) mention 'authoritarian stack' on their sites, and xof-research just links back to authoritarian-stack. There is no information available.

Addition: I personally also find the information is not really new (maybe even incomplete, there is more and not everything is related to the U.S. alone). I don't question the information in general, but it's a bit sensationalist. But that's just my opinion. It's also a bit funny that they warn of 'authoritarian stack' and explicitly mention Xitter, but their only social media account (with no message sent so far) is then on Xitter.