Exactly. Except that I’d say the nausea on later incidents is real nausea, too, even if it’s an involuntary and unconscious response. The cause of the sickness is internal, but the feeling of sickness is totally real.
Conditioned taste aversion doesn’t require something you don’t like - it just requires getting really sick afterwards. I loved my toasted pitas. And @BitBucket probably enjoyed the ice cream topping and hot dogs when he was five. (You know many 5-year-olds that dislike hot dogs?)
Dr.(?) Garcia’s original work in the area was on feeding sugar-water to rats. Rats normally love sugar-water and prefer it to regular water… but after giving it to them the first time, he dosed them with high levels of radiation, making them sick. After recovering, most of them refused sugar-water. (Something like 90% refused the sugar-water after getting sick, if I recall correctly. Totally not normal.)