Its pretty damn clear that Larsson was playing under unnecessary stress knowing that if he was making a mistake he was gonna get benched or sit a few games. You cant play your game that way, you overthink and its making you make bad decisions. It might sounds sily and easy to think "just grow some balls" but its definitely a thing and some players are struggling with that, confidence is HUGE for an athlete. Huuuge.
Also larsson's asset is passing and his decision making. Hes never gonna be super fast, have a canon, be a bone crusher or wtv. So Deboer was fvcking with his main asset, no wonder he was struggling.