Hold up there SCM.
First off, the sox cannot offer anything to Matsui for another week or so. Free agents are the property of their respective teams until 15 days post-WS. So the sox may be preparing one, but they arent allowed to offer one yet.
Secondly, that article was from a Japanese newspaper. No doubt, it is an attempt to drum up more interest from the Yankees POV.
Third, it makes no sense from a sox position. Matsui can still play the OF, IMO, but he cannot be counted on to be a regular LFer. That is what he'd be in the sox lineup. So it doesnt make much sense