Something to remember is this is the last stage for everyone, except for those interested in GC or the stage tomorrow.
The time limit in the TT doesn't matter (because you can't be eliminated... from a race which is over!), so tomorrow we could see riders finish way down in time & not care. So today is the day the Vuelta ends for 90% of the peloton.
And that goes for TJV as well, i.e. anyone working for Roglic can throw all their last bit of energy into the stage today.
What, do you seriously believe that? That most riders will gladly have a DNF to their name because "they finished the race anyway"? Let me tell you something; that is not correct.