Simplistically yes, but that does not explain why they failed to take what they needed to survive in terms of adequate clothing and footwear, and why Semyon's #1 priority appeared to be to take a second camera he apparently had.
That's why, if the tent was on the ridge, the only logic which works is for there to be a delay between dropping the tent/covering it with snow and leaving, during which time they laid inside their trench, perhaps thinking a sudden powerful squall would pass, and in the interim hypothermia set in on the underdressed trench diggers.
Then when the group left, either as one or possibly in two groups, one better dressed going to build a den, the other an unsuccessful fire, the underdressed did not feel the cold and were already paradoxically undressed, as it were, suffering from a cognitive impairment due to the cold so that they forgot things, while better dressed Semyon, Lyuda, Aleksander and Tibo knew they had to get out of there, with Semyon capable of thinking he should take his camera, for whatever reason.