While I agree to some extent (you occasionally get a decent player in league one after all!), Henrik Larson last played played for Celtic in 2004, more than 13 years ago. Scottish football has declined significantly since then.
He's usually pretty quick to rubbish rumours though (even when they turn out to be true!)
The fact that he's not dismissed this might mean that there's something in it. or possibly more likely that the club are happy for this one to be believed and talked about so that the actual targets remain...