The audio of Spider-Man ordering the drones to be destroyed was taken from the end of that fight, so it must have been made after the fact.
On the one hand, the video certainly had to have been created after the battle between Spider-Man and Mysterio was over.
The idea, from Reddit, that the video had to have been created after Beck’s “death” and therefore he must be alive, is interesting, but I’m not sure it’s ultimately compelling.