That claim to be making a stand against media vanishing but they're suggesting people avoid that risk by buying DRM-riddled physical discs that WILL eventually succumb to bit rot long before "generations to come".

They're either being disingenuous or they are so far removed from the reality of how their works exist in the context of the end viewer as too render their views valueless.

If they actually cared they would be insisting that their works were released on physical discs AND downloads presented with zero DRM and then encourage viewers to understand about backing up their media. They're probably some of the few directors with enough clout to try to make that happen.

In short they are taking out of their SCART sockets.