You appear to have missed the words "alpha" and "proof of concept". Further, this is explicitly mentioned as an alternative to file lockers, on the grounds that

You appear to have missed the words "alpha" and "proof of concept". Further, this is explicitly mentioned as an alternative to file lockers, on the grounds that they can delete the file in the future. Whether or not this is a good/productive/useful idea remains to be seen, but you haven't really raised a substantial rejection.