Hans Hahn

[Nokose]

Looking at the morning of the 04 Sep 1940 in the Folkestone raid time period of 10:10-1020 (09:10-09:20 British) there are only two RAF losses in the Folkestone area. 111 Sqn lost two Hurricanes at 09:15. The 66 Sqn lost two Spitfire at 09:50 and 10:00 beyond the time of Hahn's claim so they're not part of the search.
For two Hurricanes this is what Tony Woods list has:
Oblt. Otto Bertram 1./JG 2 Hurricane 10:10 Folkestone
Oblt. Adolf-Friedrich Götz 1./JG 2 Spitfire 10:10 Folkestone
Fw. Willi Reins 1./JG 2 Spitfire 10:10 Folkestone
Uffz. Hans Hahn 4./JG 2 Spitfire 10:15 Ashford
Oblt. Rudolf Unger 2./JG 54 Spitfire 10:20 ?
Oblt. Hans-Ekkehard Bob 9./JG 54 Hurricane Folkestone
Fw. Fritz Dettmer 9/JG 54 Hurricane 10:10 Folkestone
Oblt Richard Leppa 3./JG 51 Spitfire 10:30 ?

So eight claims for two fighters lost during this time period. Again very bad odds that Hahn actually got one of these and "Folkestone" seems to be blanket coverage of this area.