Committing binary files to source control rather than including build commands to generate the files is a bit of a red flag.
A good reviewer should have, even for a binary test case, asked the submitter to simplify it to the smallest or most basic binary required for the functionality.
Additionally, a complex example may require multiple conditions to fail and if those aren't split into multiple tests then subtle bugs can be reintroduced later because that complex test doesn't cover all potential failure conditions. If there need to be test cases for multiple related bugs then they need to be minimal to demonstrate the failure condition combinations they are testing for.