Here is one of the provisions of interest:
https://gdpr-info.eu/art-5-gdpr/
Ubisoft also cites GDPR provisions for deletion of inactive accounts:
https://www.gamepressure.com/newsroom/ubisoft-removes-player...
They could equally well have said that an account which was inactive for 2 years, or 3 years would be deleted and still be legally compliant.
If you have regulators breathing down your neck being conservative on time isn’t a terrible idea.
Malicious compliance. They deliberately misinterpret and continue to get pulled up on it. For example, just recently: https://www.bbc.co.uk/news/technology-63784393
This completely contradicts any argument that their interpretation of privacy regulation is remotely compliant. They cross the line in their favour relentlessly.