Eating a live bat was never considered the viable infection route.
Your unintelligence may have made you believe it was, but it wasn't.
Bats, like the Horseshoe bats which incubated SARS, eat insects. Many insects feed on the blood and other body fluids of various animals. Insects transmit many diseases. When the bats eat them, sometimes the diseases survive (by adapting). Then they can be passed back or onto other animals and the process of adaption can happen many times.
Eventually, a new disease (like COVID-190 can emerge. It can be passed onto other animals (like mink, weasels, pangolins), which can harbour the disease without any or many ill effects. When a human is bitten by or butchers that animal the infection can pass to a human, where over time it might be introduced to the human body enough to adapt to survive and be communicable.
The same process has caused dogs in West Africa to be infected with Ebola, which doesn't kill the dogs but allows humans to contract Ebola from dogs.
Given China's economic development and urbanisation, and the fact it happened not long previously, it is the strongest theory.