> C# is not a systems-programming language

Incorrect, the main restriction are the targets supported by CoreCLR/NativeAOT/Mono(to an extent).

Or, at least, if you pick all memory-safe languages with GC, C# offers the most when it comes to low-level access.

> I am looking for memory-safe languages that can be used for systems/graphics programming.

I'm going to assume the author isn't trying to write a kernel.

You've left out Cosmos - https://www.gocosmos.org/, which itself is primarily written in C#.