There’s a vast array of food borne gastrointestinal illnesses with incubation periods ranging from minutes to months. There’s also a vast array of levels of immunocompetence and response to infectious with any of these agents. Here’s a reasonable layman’s guide:
https://www.abc.net.au/news/health/2...use-it/7535682

Like it or not, none of us can really say if OP did or did not have food poisoning, whether the BA food was responsible etc. Even if microbiology testing had happened, there’s no proof that whatever bug isolated originated from the BA good (especially since it seems most if not all of it has been eaten/disposed of/reheated). If there were multiple complaints it might be indicative but it seems only a few rows were served the dodgy food before it was additionally cremated; what proportion of the people in those few rows would know that they can raise a complaint with BA? What percentage of those would bother?

BA will doubtless hide between this plausible deniability however may be convinced to make a customer service gesture which may or may not make OP feel better