It's a mind game combined with an excuse. Make us think he's out, fool us by putting him in. And when they get smashed regardless, they can ifithadnabbenferRashfordbeinglessthan100%...
Win-win (without winning-winning)
Really? Surely it'd be easier to focus on trying to play better football than to bring on a sub for 15 minutes, involve him in a collision, and then pretend he's injured so you sub him, so that Klopp thinks he's definitely not playing in 4 day's time?
Seems pretty far-fetched, and also slightly egocentric, no?