Completely agree. But to be fair, they are not claiming they will make or win the World Series. They are just claiming they are a sleeper. Stranger things have happened in sports. For example, I think the Sox winning the World Series next year is more likely than a basketball team coming back from 23 down with 9:10 remaining to win a game...and that happened last night.
But yeah, there is no realistic chance the Sox are winning it all next year. And getting +3300 odds isn't even close to worth it.