This is just one of the official statements made by Ms…
“With very few exceptions, virtually all add-ons that work in Microsoft Flight Simulator (2020) today will function in Microsoft Flight Simulator 2024. Add-ons that were purchased from the in-simulator Marketplace will not need to be re-purchased in Microsoft Flight Simulator 2024”.
I also heard them say durn a dev update talk flat out say that all 2020 AC would be compatible and brought forward. Ms made several statements like this, several times.