I see your burnt-out fiberglass light-sport aircraft and raise you three burnt-out aluminum Cessnas and Pipers.
Of course none of these fires have any relevance to the case at hand, as they are uncertified aircraft (your case) and CAR3 / FAR 23 certified aircraft (my case) which have no requirement to be tested or certified to prevent burn through as FAR 25 aircraft have to be.
This entire argument regarding the autoignition temperature of aluminum and CFRP is bogus from the beginning as it ignores thermal mass. Place a 2" thick paper textbook and an empty aluminum beer can in front of a lit propane torch, and let me know which one burns through first.