To be honest, I am not sure. If it is not discernible from the rules in the Google Doc, we will have to ask the commissioner who is The Turtle, or perhaps another past commish/vice commish knows?
My role is pretty much limited to roster updating and transaction policing

Obviously, Strat's in-season rules would dictate player movement during ongoing seasons. So if player movement is prohibited in the current Strat season, I think it would make sense to announce trades agreed to during that time after the Strat season is completed.