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It's not targeted at a single language. Just like rake with regards to ruby, I could use this to perform tasks unrelated to haskell code.

The short description says "a rake like task management tool _____for______ haskell". It doesn't say "written in haskell".

The trouble is that to run more complex operations, it's nice to have a high-level language to write your tasks in. Rake uses Ruby for this, and Nemesis Haskell.

Either app can be used for other purposes, for example, I use Rake to compile/run tests on my C# projects as an alternative to NAnt.

"for" as in, the software is written on top of and in Haskell. As in, it's exactly what you just described.