That's a "put your money where your mouth is" move by Shell, saying in effect, "We think our future prospects are better elsewhere than in bitumen production in Alberta".

Producing energy with fossil fuels still has a long life ahead but it's going to be on a declining trajectory.  Renewables aren't the sole answer but they are increasing their share, and sooner or later the irrational phobia about liquid thorium nuclear reactors will be dispelled.