I'm not quite sure what point you are making.
You are surprised, ok. But other monks probably aren't. Perl is ubiquitous, that means it is everywhere, even at Microsoft. I would expect that it has influenced more than a few design decisions, particularly with the recent design of C#. For instance Eric Gunnerson, a Microsoft Programme Manager for C#, admits to being an "old Perl guy" and has used perl as a benchmark for text processing speed.
The world is full of entities that refuse to line up neatly into stereotypes, and that includes Microsoft.