I would be curious where they are seeing >90% pregnancy with single digit ratios. I suspect that is a population with much higher deer density than currently exists for mule deer in portions of eastern Montana.
FWP fully acknowledges that the current surveys are inadequate for population estimation due to lack of detection estimates, but no one here is claiming that. The current data are perfectly adequate for the trend analyses being discussed, and the trends have been trending for quite some time. They also jive with trends in harvest data, recruitment data, and anecdotal data.
I do agree that there are likely several issues contributing to poor recruitment, with poor body condition of does being a significant one over the past few years. But given these additional factors, a buck:doe ratio trending towards single digits over that same time period is certainly not evidence of a factor having a positive influence on the situation.