Sam's wine knowledge is a call back to the conversation about him becoming a sommeliers as a cover.
He appears to have kept his knowledge up to date as 2002 was an truly exceptional year for champagne and 2007 was also a very good year.
However, it is a widely believed (and taught) falsehood that aging champagne makes it better. Vintage champagne must be aged at least 15 months before release, aging after that is just the buyer depriving themselves unnecessarily.