You're missing it. Here's what Joel is saying without saying it: C# 4 is "that l...

mattmanser · on April 23, 2011

Given that the article is from 2006 that'd be some prescient writing.

Also at the time of this article they had their own custom language Wasabi. This article explaining Wasabi is dated a month after the original article:

http://www.joelonsoftware.com/items/2006/09/01b.html

It's based on VBScript, not C#.

astrange · on April 23, 2011

C# 4.0 didn't exist when the article was written in 2006.