Yeah, I get why they're trying it at the moment but in the FS for example they actually got a full point less for their twist than A/K did. If they can do it cleanly with a good level and a positive GOE it might help them catch M/G in the final and could provide a buffer for jumping errors but if they do the quad twist the way they did it here and A/K go clean then they could end up in 3rd place.
If I were them I'd save it for Russian Senior Nats. They won't get on the podium there anyway (most likely) and it will get everyone talking about them even more.
I would go with the triple twist also because we need to remember that they got 8.31 points for their 3Tw4 twist in JGP Czech Skate and they would need to have a really consistent and good quad twist to top that. Otherwise it is not worth it.