According to Microsoft that's all you need to run Windows Server Core also:
https://learn.microsoft.com/en-us/windows-server/get-started/hardware-requirements?tabs=ram
But that does not mean it will run well or your apps will preform properly.
I know I am drifting a little off-topic but really, Windows Server with only the CLI fits in just 512MB of memory?
That is quite incredible. I already knew that this was possible under Linux, but not Windows.
It is a bit too bad that you have to pay for all the Windows Server versions by buying a license though. Otherwise I could see a use case for a bunch of old (windows) computers that need to run some obscure Windows software in headless mode.