That folder most likely contains more formations than just 4-4-1-1. And there's two options that are imo way more likely than us switching to 4-4-1-1
First, that he's using pre-season to have some fall back formations, and is drilling into to the players, which adjustments are needed from each player, if he calls a switch to that formation. In any case, it's very close to 4-2-3-1 in execution.
Secondly, what I find most likely of all is that pre-season is being used to drill the squad in playing against a variety of formations. So the folder is just a tool for setting up the team against 4-4-1-1 and other formations.