Competency based admission is still evolving so admission policies ares still evolving. But competency based admission places the burden on the applicant to prove they have achieved mastery in a variety of science, social science and mathematical disciplines that are currently covered by pre-reqs courses.
From what I’ve seen, the bar to establishing competency in a particular subject area for applicants who have not taken the traditional pre-reqs classes is pretty high. It’s things like applicant “has done long-term/multi-year research in biochemistry of cell signaling” or applicant “has developed a new statistical analysis method for identifying novel mutations in fruit flies” or applicant “has published peer-reviewed journal article on ______.”
And just because a med school no longer requires specific courses for admission consideration that doesn’t mean they don’t have admission requirements. They do. In fact, there’s an argument to be made that the flexible policy schools have expectations that their applicants will have even a deeper, more sophisticated grasp of the scientific knowledge base than those with traditional pre-reqs.
Non-science majors who do not take the traditional pre-reqs are pretty much destined straight for the round bin.