Version v3.0.0 introduced a breaking change where timestamp bounds now expect milliseconds precision but in the sample code there is a comment that staleness is specified in seconds. Same issue is also present in the documentation for the client library.

Sample should have following options to perform 15 seconds stale read:

const options = {
    // Guarantees that all writes committed more than 15 seconds ago are visible
    exactStaleness: 15000,
};