The tool allows to check for large files in a git repo with the intent to put it under git-lfs control.
Specifically it will check for parts being changed often.
The tool requires "git" to be installed using "git rev-list" and "git cat-file" to inspect the object store. Read more about git-plumbing at git-scm:Git-Internals-Git-Objects
The code is doing what it had to do. There are surely some features missing.
Please create a ticket.... and dont' forget to create a testcase.