What should the OS/Arch show when I am in Linux Container mode on Windows

I am trying to pull redis on docker windows running under Linux Container mode.

I get:

docker pull redis
Using default tag: latest
latest: Pulling from library/redis
no matching manifest for windows/amd64 in the manifest list entries

Should it be still be showing windows/amd64 as the OS/Arch when I am running using Linux Containers?