Hi T! If you go to the post (you can click on the Twitter bird logo on the upper-right of the post above), and scroll down, you will see 1) another video of it, and 2) Vecchione's hot take on it -- he says it's Archi, and to your point, not well (..."looks dead" is the exact quote. I wonder where @OB is on this?
Architeuthis, based on all info this clip gives. I seem to recall footage like this from an A. Dux specimen that eventually ended up dead along a jetty, I can do a quick scan on youtube to see whether or not I might retrieve it