I found this web page:

http://www.moscow-orchestra.com/rates.html

The parent article here implies they will be recording, e.g., all of Beethoven's symphonies, etc. Off the top of my head, this project sounds like at least a week's work, even assuming the players know the music well.

40 players + 5 miscellaneous (conductor, recording engineer, whatever), say, 45 people for a week at $11,000 comes out to around $6/hour. I'm not saying the guy is lying about it, I'm just amazed at how inexpensive this appears to be. Even double that rate, or triple it... that's some pretty awesome work you can get done for that amount of money.