She has literally never restrained another human sized opponent this way, show scans or this isn't in-character and she won't do it.
I call bullshit on this as they have never attempted to kill someone until Volume 5, otherwise they would've made certain to kill every grunt the enemy has sent at them instead of just knocking them out.
It doesn't matter since the Predator can literally spam these attacks at no detriment to himself whatsoever or even just straight mind control/seal them with it.
Weiss is not gonna restrain him, we've been numerous times, that was a one-off against an opponent significantly larger than her and she never did it again in this Key as far as I'm aware. Secondly their team attacks are formidable but the Predator has dealt with greater numbers than this in a single battle as it successfully 5v1'd Shinnok, Johnny Cage, Raiden, Fujin and Sub-Zero without taking much damage and based on the way that part was described it wasn't due to a massive stat advantage, it was through his combat skill. He's also fought against a majority of their arsenal before as it killed everyone in the Mortal Kombat Cast in its MKX ending so it has experience with all of these barring Gravity Manipulation and a lot of those characters could also straight up teleport so it could predict Ruby's blitz attempts. They will certainly put up a fight but I believe the Predator has the advantages needed to put them down.