Also, ‘red food colouring’ differs between countries/jurisdictions. What counts as ‘red food colouring’ in the USA and South America for example, is banned in Europe and Australia as being mildly carcinogenic. This happened back in the 1980s. Here we use a different compound for the purpose - eg annatto. So where and when was the original study done? Essential to know exactly WHICH red food colouring is the potential culprit. Also yellow food dye is similar situation. Was that in the original study???
Actually I think I know that study - it’s fairly famous for being deeply flawed in it’s methodology and interpretation of results. It also pre-dates the numerical code for additives that we see on labels nowadays. So it’s hard to actually compare to modern products however processed in this country.