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> That would only fix the build machine's problem, it wouldn't fix anyone else's builds.

It would fix everyone else's builds if they added determinism in their builds (as opposed to adding non-determinism in the test-procedure). Besides, a test-procedure never gives a guarantee because a bug depending on non-determinism can be subtle.

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> a bug depending on non-determinism can be subtle.

That's the point - to uncover bugs dependent on nondeterminism by using a filesystem that introduces it. This is for fuzz testing at the filesystem level, not literally reproducing the builds correctly multiple times.

From the linked README:

"This is useful for detecting non-determinism in the build process."

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