He meets the standard of at least 5 kills.Of course no military has ever made the term "ace" official the general standard is 5 kills and the V-1s where not easy to take down both the 'tipping" and the old fashioned gun kill where risky.
During WWII the Luftwaffe did use the term "
Experten" a title given to pilots with many kills I do not recall the amount but it was more than 10 aircraft.
I think a German has the record for most kills in one day that would be
Hans-Jochim Marseille who destroyed 17 aircraft in one day not all in the same sortie though but still wicked.
http://en.wikipedia.org/wiki/Hans-Joachim_Marseille
The the pilot that earned 5 killed most rapidly is Muhammad Mahmud Alam a Pakistani air Force pilot he downed 5 Indian aircraft in one minute!Allah it seems favors this man.
http://en.wikipedia.org/wiki/Muhammad_Mahmood_Alam