Do we need Discriminated Unions in C# 9?

In this video ( https://youtu.be/ABfZfTSsyt4 ) I have learn that Enum and Discriminated Unions are similar, but they are not the same. Enum can be combined and Discriminated Unions are for the heterogeneous data. I still can not understand. Do we really need Discriminated Unions in C# or this proposal is a clone from F#? is C# OOP or it is now a multiple paradigms programming language?