It's not in that article. I'm too lazy to dig up the link from 49erswebzone.com, but the Niners are said to have issued a warning letter to Crabtree stating that his offer will be reduced if he doesn't sign soon. That was before Singletary confirmed that they are considering modifying the offer this morning at his press conference. In fact, that was the whole reason the contract "modifying" was brought up at the press conference in the first place. It's a threat to Crabtree.
There were also a couple links to outside sites but the Crabtree discussion thread is well over 200 pages and I'm not gonna go thru it all to find them. Sorry.