(1) These are cumulatives. So, KB4559004 likely brought in the stuff of KB4560960 (along with its new goodies). You can block it with WUShowHide...
How to temporarily prevent a Windows Update from reinstalling in Windows 10
You've got to try to catch it coming in again. Be prepared with WUShowHide immediately after doing the uninstall.
(2) But what about installing KB4567512 instead, as I posted on page 5 of this thread? That is the cure for 1903/1909. Then let KB4559004 alone.