Some fans are saying he looks injured, that he can't put weight on his wrist or leg during these drill which explains for the weak effort. Other are saying that he is mentally drained, that he looks completely uninterested in putting more than the bare minimum effort, which by the looks of this video, is being generous.
To be fair, Elias Pettersson had probably his best showing of the season last evening against the Ducks, where he actually appeared to have some pep in his step. He recorded a Game high 6 shots (on 9 attempts), and had himself a night in the face off circle winning 76.9% of the draws.