Sorry. Colorado has lots of Aspen trees and not lots of wolves ( yet ).
Elk prefer to eat grass and not tree bark. We have been watching elk herds for many decades. Some one is misleading you about ‘tree eating elk.’
There are things that do kill Aspen trees, but elk are not eating whole forests of Aspen trees.
” I got the impression that there were a few areas where the aspen survived and are now regrowing since the wolves are discouraging the elk from eating them.”
The report I saw was not about elk eating all the aspen, but rather the aspen along the streams. This was causing erosion and damage to life in the stream, including the ever popular trout. Now they are not doing that and the fishing is supposed to have improved.