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Isn't there already an OSS version of the Code - https://flathub.org/apps/details/com.visualstudio.code.oss

Or is this Linux only?

That's a Flatpak version of Visual Studio Code, which only works on Linux. Unfortunately, it's unmaintained and stuck on version 1.41.1 (December 2019).

Arch Linux users do have access to a fully open source version of Visual Studio Code in the community repository, which includes access to the Visual Studio Marketplace:

https://www.archlinux.org/packages/community/x86_64/code/

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