Its deeper than that. They are more concerned with the weak era suggestions as such suggestions undermine Federer a lot because most of his GS came during that era. So Fed fans will push anything that would give an impression that weak era was not a weak era in fact. The reason behind choosing Safin match is because it suggets 1. Safin needs to be projected as a player s great that he would beat even peak power playing at his weak. Bigging up of Safin, Roddick, Hewiytt is essential to deny weak era suggestions.
2. Federer never played at the same level after 2007 so any losses after 2007 can't be an option here as after 2007 Federer was declined and didn't play any good to make this list. If they had chosen any match like 08/09/10/11 or later it would have been an acceptance that Federer played good even after 07 and such acceptance would lend credence to weak era theories.