You create a rule to block connections for /System/Library/PrivateFrameworks/MobileSoftwareUpdate.framework/Support/softwareupdatedCare to share a little 'How to' ?
But that will disable all updates, including those for Sequoia and XProtect.
Little Snitch 5 Help - Configuration - Create and edit rules
https://help.obdev.at/littlesnitch5/lsc-edit-rules
Protecting against malware in macOS
https://support.apple.com/en-euro/guide/security/sec469d47bd8/web