It may be possible that overcooked "red meat" (lol, like cow is the only red coloured meat) has some cancer promoting properties. So does black tea BTW, its a proven genotoxic (unlike these studies which are not cause based).
Because this study isnt cause based, the increase in cancer could be for a number of reasons. Perhaps these people eat less anti-oxidants. Several of the studies are on meat and carb combinations like meatloaf and burger patties. Whatever - It could be anything.
Basically with only association, not cause, these studies are scientifically meaningless. But it is possible that overcooking "red meat" can cause toxins of some note. Heck its not like all grok ate was overcooked cow! But until theres a smoking gun, theres no real need for panick.
Future research, on a direct genotoxicity etc studies will be all that will really know for sure. Just cook your beef slower, at a lower temp, or more rare - if your worried. And if your not worried, thats perfectly justified, as these are not cause based studies, they are scientifically similar to supersitition (when I jumped up and down twice, the rain fell, therefor, jumping up and down twice causes the rain to fall)