i think you are mistaken, April 1st is the release date of win11 hypervisor which lets you select the fully operational and supported version of windows of your choice. Sadly it only includes Vista 1.0, win95 1.0, and win10 as options.
April 1st 2020 is the release for win7 and winXP.
and before you go and say that you can do this already using linux or osX well... win11 doesn't require the internet to connect to the internet. the 73 GB is really a super compressed version of all the internet.