Hi @okunos
The list is maintained by Microsoft and we can't edit it. You can refer to this doc for more information.
Sometimes, a website does not recognize the updated version of the Microsoft Edge UA. As a result, a set of the features of that website may not work correctly. When Microsoft is notified about these types of issues, website owners are contacted and informed about the updated UA.
The sites often need some time to update and test the UA detection logic to address the issues that Microsoft reports to site owners. In these cases, Microsoft uses a list of UA overrides in our Beta and Stable channels to maximize compatibility for users who access these sites.
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Regards,
Yu Zhou