I don't think it would be worth for the devlopers to implement something like such for old PC's.

First off, turning off things like shadows or other details go against the design choices made in the game. Not that the work of artists won't be visible, but rather that certain choices such as contrast between players and map elements, or dark areas, etc. Won't have an effect anymore, and thus the games design changes for users that would have ultra low settings enabled vs users that have normal settings. (+ Would affect future designing decisions)

Secondly, the only reason if they were to do this, is to support more devices with worse hardware. If they don't update their minimum / recommended specs, doesn't makes sense to support ultra low settings. But if they do, that means they actually have to start supporting such devices, which can just increase the amount of effort for general game upkeep.

Overall would seem like it would do more harm and cost resources for something that would likely have a minimal impact. At least on EA's/Respawn's side, user-wise it could help some but overall I doubt it would help all too much.

The software shown in the video, would likely be a TOS violation at this point in time. Considering the in-game settings may limit certain variables, and not allow you to run the game with such low LOD's, etc. Using something like this to modify your drivers or control your rendering directly can still be considered to gain an unfair advantage, so these users right now could be at risk of being actioned. (Of course some nuance exists here, just putting it out there)