It means they set the page up in such a way that all the classes/ID's are hashes are unique on every page load. This means you cannot have display filtering rul

It means they set the page up in such a way that all the classes/ID's are hashes are unique on every page load. This means you cannot have display filtering rules for these things (at least, not easily). Truly top-tier malice also puts tracking logic behind a reverse proxy that delivers randomised URLs, so you also cannot filter network requests.