I think whimsicalism's point may be that, if C# isn't the tool of choice for this port, then that's the death knell of C#. The death knell isn't what kills it; that's the death blow. The death knell is sounded after it's dead. If C# wasn't the choice here, then C# is already dead.
That may be overstating how dead C# is. But I think it is accurate to whimsicalism's point.
That might be their point, but it’s a bad implication for why languages get picked
Languages are languages, so having lots of people to communicate with using them is pretty important. Most people don't want to learn Latin.
I'm not even really making an argument for C#, more just what it signals for C#. I am not a C# lover (although I also don't really love love Go).