There's no such thing as "LINQ bytecode". LINQ is just syntactic sugar that can coexist with vanilla C# (or VB.NET, or whatever) because Microsoft decided to modify its compiler and IDE to allow it. It is fundamentally impossible for you or me to make a similar change, unless we're willing to eschew the Microsoft toolchain.
In Clojure, you do not have the same limitation. That's the only point the article was making, and it's completely correct in that respect.