I not sure this is true.

As I understand, humans have an extremely acidic stomach compared to other animals, even carnivores. Our stomach acid is on the level of scavengers, and this is to kill bacteria and parasites in the food we eat. Humans could be more tolerant of spoiled food than most other species.

The modern western diet/lifestyle can damage our digestive tract in ways that affect our pH and microbiome making us susceptible to what we should normally be tolerant of. Anyone taking antacids or dealing with heartburn type issues I would expect to more vulnerable to food poisoning since any pathogens can more easily pass deeper into our digestive tract.

The short digestive tract in a dog is all that is needed to extract nutrients from animal sources, digesting plants requires help from a microbiome and they need somewhere to live and do their work, this is why plant eaters have extensive digestive tracts that are not very acidic so they don’t kill them off. Humans (not sure about other animals) neutralize the “chime” exiting your stomach so that it’s pH is appropriate for the microbiome living in the intestines.

The human digestive tract suggest sit evolved for adaptability, a healthy human can safely eat anything from carrion (not saying it’s fine, just that we evolved to be able to survive it), be a vegetarian, or eat mostly meat and thrive.