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#10
I saw this reported on other forums and tried it myself.
Proof of the pudding is in the eating.
Mount a 20H2 iso as a drive, run setup.exe to do a repair upgrade.
You will see that it will only let you select to keep nothing.
Then cancel upgrade of course.
Then remove the enablement package (reverts you back to 2004), and then mount 20H2 iso and you get option to keep everything.