I think you're right. I found this on the AAMC website:
Application and Acceptance Protocols - Admission Officers
The AAMC recommends the following guidelines to ensure that M.D. and M.D.-Ph.D. applicants are afforded timely notification of the outcome of their applications and timely access to available first-year positions and that schools and programs are protected from having unfilled positions in their entering classes. These protocols are often referred to as “Traffic Rules” by admissions officers and pre-health advisors. These recommendations are distributed for the information of prospective M.D. and M.D.-Ph.D. students, their advisors, and personnel at the medical schools and programs to which they have applied.
The AAMC recommends that each M.D. or M.D.-Ph.D. granting school or program:
4. By March 15 of the matriculation year, issue a number of acceptance offers at least equal to the expected number of students in its first-year entering class and report those acceptance actions to AMCAS.
I'm not sure if these are treated as just optional guidelines or if they are firm rules, but it looks like Baylor's class is now full, and any post-interview applicants that haven't heard back by now are either waitlisted or rejected 🙁