I imagine a death march to be something worse than that. In this case everyone shared the goal, it wasn't a made-up deadline forced on underlings by a clueless management. This management knew they could do it, and the team knew they could do it and had done it before. That's what they were there for; the thing they hoped to be able to do.

When I think of a death march, I think of an engineering task (usually a software program) with a known-impossible deadline, where the team pushes back on the deadline and is ignored. Necessary tools not provided, work hours monitored, rather than progress, etc.