Unity is in the process of moving more of their codebase into C#, backed by some in-house compiler work, yes. And they did indeed use C# extensively before then for game scripting, even if not exactly 'pure' or high performance in the same sense.

The work in Unity's Burst/HPC# is very recent, though, and the CoreCLR/language features I rely on in bepuphysics are still pretty obscure. I wouldn't expect most people outside of the weird niche I live in to know about the ecosystem's progress.

In other words, I was just trying to get an unaware visitor to raise an eyebrow.