If you're using Rockstar Launcher you cannot rollback nor stop the update it appears.
If you're using Steam, just google how to rollback RDR2 on Steam, you should be able to find it. Can't guarantee it works though
Yeah I can confirm nothing asi related is working either due to the update about 5 hours ago, and it won't work until one of the asi loaders gets updated. Shame really, especially since this update did little to nothing