This type of activity could lead to managers not allowing edited posts to count which IMO I think would be great. Is he cheating? Technically no, but other managers may not feel the same way. Depends on the rules for the most part.
My question is why make such posts and then edit them later on, precisely towards cut off time? If it was done once, I think it would be counted as a mistake, but more than once? That's a pattern and for some reason, he was thinking he'd get away with it as he has been doing.
There was a user, I think Can't say is the name, who does this little worded posts after the creation of a thread and then he'd go later on to edit, the user gave his reason which was quite reasonable so I think it will be nice if Saint-loup also came here and explained too.