My only guess is that he loosely throws around the term "crap"! He might feel his upgrades are significant but many of the mic's he desicribes as "crap" prior to the mod is just not crap.
I think the way to look at this is that he is saying he can improve on any mic's performance that he lists in his mod section, thus making the unmoded mic sound veiled in comparison and thus when given the option between the two an easy choice. Whether this is true or not I don't know since I have never heard a shoot out comparison.