I know I thought it was weird too when i saw it…I heard the same exact thing you are talking about…he drops down to like 19X lbs in the offseason.
Here are a few links where they note the stats I am talking about
http://www.nfl.com/draft/profiles/polamalu_troy
http://sportsillustrated.cnn.com/2006/writers/nunyo_demasio/01/30/polamalu/index.html
http://www.google.com/search?q=troy+polamalu+bench+press&hl=en&start=0&sa=N
Here is an article talking about some of his typical training he does