BinaryWriter: Out of context paragraph

The second paragraph under Remarks at https://docs.microsoft.com/en-us/dotnet/api/system.io.binarywriter.close?view=netcore-3.1 seems apropos of nothing.

https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.IO/BinaryWriter.xml#L458

Is it saying that close calls Flush but I also need to explicitly Flush an Encoder somewhere?

The same text appears under Flush (https://docs.microsoft.com/en-us/dotnet/api/system.io.binarywriter.flush?view=netcore-3.1)

https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.IO/BinaryWriter.xml#L669

It's even more confusing there - when it says flushing the stream it is presumably talking about the underlying stream - but explicitly calling Flush on the stream or the writer?