It's still a bit janky compared to their own GDScript, but C# is supported yes. Because there are two languages though, and C# is the second class citizen, you won't find as many examples on how to do things in C# as in GDScript.
Thanks for the input. Given my background, I think I can figure out the syntax just fine if necessary. I am just sceptical of languages where typing is not strictly static (and I give a hard pass on pure dynamic typing).
FYI a lot if not all of the core docs actually have tabs on any code samples to switch between c# and gdscript so while tutorials from third parties tend to focus on one or the other, the core docs are a bit better.
I've started going through a tutorial on youtube from I think finepointCGI about a horror game in Godot, he is actually doing it twice, once with GDScript and once with c#, so if you want to see someone with some godot experience using c# give it a look.
