Out of curiosity, if the story had been that the German pilot said, "Yeah, I got shot down by one of those double-tailed b*stards", would you disbelieve it unless there were 2nd sources or German biographies that call the P-38 "the Double-Tailed B*stard"?
Also, what would it take to believe the story?
If the story had said in it "I talked to Sgt. Bob Smith, who was in charge of holding a prisoner at Camp 32 near Tunisia. According to Sgt. Smith, at 4:32 pm on August 2nd, 1943, a German pilot approached the camp and surrendered. During interrogation . . .", and then related the same story, would you believe it then?
What if it said that and "I also checked with Camp 32's Intelligence Officer, Lt. Brad Jones, and he corroborated what Sgt. Smith said" would you believe it then?
Or would you only believe it if another author said "To check out the story related in Life's Aug. 16, 1943 issue, I also went and talked to Sgt. Smith and Lt. Jones, and they told me the same thing"?
Or would that be insufficient still because you didn't read a book by a German that said "We commonly called the P-38 'der gabelschwanz teufel'"?
What if Germans didn't commonly call it that (the Life article doesn't say that the Germans commonly called it that -- they say one guy came in who called it that)? Would you need personal accounts from that guy or his squadron mates in order to believe it?
If you need that level of proof, do you distrust the majority of first-hand accounts such as Samurai, by Sakai, The First and the Last, by Galland, Fighter Pilot, by Olds, With the Old Breed, by Sledge, and so on? (Note here that I am saying "majority" and not "all" since these books have some portions, which are small compared to the entire books, that are readily verified, just as there are many sections in Caidin's P-38 book that are readily verified.)