You can definitely play in this way.
I have been pretty staunch about never playing metal like this but I’ve come around on it.
The only major downside I’ve found is that doing extremely fast bursts of sextuplets or sixteenth notes between large 5 or 6 string chords like you might hear in black metal is more difficult, because then you have to keep changing your orientation which to me seems illogical.
As always I’m sure there is someone somewhere doing it this way, so your mileage may vary. I would also add that forcibly engaging unnecessary muscles or tensing up your arm to get the elbow motion going is supremely stupid, because then you are actually programming your cerebellum to tense up your arm every time you play, but that’s another topic that we’ve done to death on here so I’ll leave it at that.
For your benefit here is an added video of the playing form I think is ideal for tremolo picking. It’s just my opinion but if you’re aiming for this level of flexibility and control, it makes sense to imitate someone else rather than re-inventing the wheel.
edit for clarity: Ive never seen someone play like the video below by using their elbow DSX mechanic alone