Yeah, but a script that intentionally invokes /usr/bin/git has already achieved the non-privileged access the git vulnerability could provide. A script that unintentionally invokes (i. e. not to exploit) would then need to be combined with a malicious repository, which may be tricky.

But I don't want to dismiss this vulnerability – it's so easy to fix on Apple's part that they don't have an excuse. There are a few too many neglected corners of their OS where they seriously have to get their act together. But in practical terms, people focus too much on the technologically exciting or Apple/MS/<other divisive entity>-drama provoking vulnerabilities, while there's probably like one or two people working in software who actually verify every hash of every download and audit the source code for every version of every vim plugin they install.