As per this document, if we refer to the point Options for continued support for enterprise customers. It is mentioned that
For enterprises seeking assistance with moving away from Adobe Flash Player or needing continued support for line of business applications that may be dependent on it after 2020, Adobe is providing some support options. For more details, please visit the blog posted by Adobe.
To aid such customers, Microsoft Edge will allow Adobe Flash Player to load as a plug-in via the Internet Explorer mode feature. Inherently, Internet Explorer 11 will also allow this. Once you make the switch from Microsoft provided Adobe Flash Player, it will be treated as any other third-party plug-in and will not receive Customer Support from Microsoft.
So as per the document, it looks like if you are an enterprise customer then you can choose the option to use the flash as a plug-in otherwise it will be disabled.
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