Direct from the horse’s mouth: https://www.ubisoft.com/en-us/help/account/article/closure-of-inactive-ubisoft-accounts/000079595
Edit: The Ubisoft page linked here has almost completely changed in the last day.
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Rules:
If you read the page link to it doesn’t say anywhere that they will delete your old game. OP is being disingenuous.
If they delete your account with purchased games in it, how do you play the games you paid for?