Turns out I'm exactly as dumb as I thought I was. Those PECOTA numbers in yesterday's article do seem to factor in the player's parks, inflating and deflating numbers accordingly. I first noticed this when reading through Joe Sheehan's great article on Sosa and Dusty and the Cubs in BP. Reader Shawn then passed along an email to me with the correct data, showing the equivalent OBP and SLG numbers that PECOTA projects:

               EqOBP EqSLG
         Alou   343   460
         Sosa   349   513
 
      Burnitz   327   483
       Dubois   342   485
     Hairston   352   383
Hollandsworth   336   449