(To the other comment - yes, this being fraud would be an exception to the above. I am assuming it was done in good faith. If it turns out that it was intentionally designed to be misleading, then that changes things - and would be monumentally stupid of them, because publishing a method to a groundbreaking result on a preprint server is a sure-fire way of getting caught out)
If you click on the time stamp of your comment there is an 'edit' link there. (It should also be there in the thread.) It stays available for an hour or so and then it will disappear.
