After searching, and others mentioning this specific step, I gave it a try on the one system that was unable to successfully install KB5034441. After following the process the update completed successfully. Here's the link to the KB article that outlines the steps.
I don't, personally, think that this is something that Microsoft should expect end-users to do--those in corporate environments, with IT specialists is a different story compared to a home user. These steps are something that, as part of the update installation, should be checked first and then, as necessary the appropriate steps taken AFTER notifying the end-user that this additional step will be taken and then afterwards performing the update. Of course as part of that check there needs to be verification that there is sufficient disk space available for the change in partitioning. If there isn't sufficient space the appropriate--detailed--information needs to be provided as to why a particular (in this case KB5034441) cannot be completed.
If you feel that these steps are something you are uncomfortable completing yourself, then, as far as I concerned--and I believe in this instance Microsoft Support would take the same view--support through Microsoft should be available free of any charge as it is their issue to resolve (they created in to begin with!).
Good luck!