Might depend on company SOP, I know ours on this sort of thing have morphed over the years and it's sure as as heck come up in some sim debriefs.
According to the 777 QRH "Eng Svr Damage/Sep L,R" the conditions are:
>>Airframe vibrations
with abnormal indications,
>> Engine Separation.
(my emphasis).
In the video there is indeed 0% N2 but the captain mentions there was no vibration...so there's perhaps some logic some grounds for handling it as a run down and actioning the []ENG FAIL R (checklist).
OTOH I know some operators teach or have taught actioning the severe damage check list for any engine failure with extremely abnormal indication, such as a "frozen" spool, vibration or not, on the grounds that for that to happen something pretty severe must have taken place in the engine. In the real world would you ever have a locked/frozen spool and not get vibration?
Oh and above all I know "our lot" very much caution against taking the []ENG FAIL L/R message on the 777 at face value, you need to check the indications ( as they did in the video) - but apologies if you already know that.
Hope that's cleared it up
