Yes I can read French but later in the video one of the passengers says they were dumping fuel after being in flight for 30 minutes.
So it was not a matter of taking off, having an engine shutdown immediately after takeoff and then returning for a landing right away.
They decided to either continue a climb fly to a dumping site for X amount of time then return to CYUL or they were already half an hour out when the problem occurred and then decided to dump fuel on their way back to CYUL.
One comment from a passenger claims that they felt something was wrong on the takeoff roll.
So my question is if this happened on the takeoff or minutes after and you decided to shutdown the engine, would you land ASAP overweight or fly on one engine to the fuel dump site, dump some fuel maybe for 15 or 30 minutes then return for a landing?
What does the B787 checklist calls for?