It says that the biggest factor in their population collapse was a decline in the number of wild rabbits due to disease. Has that problem resolved itself or been dealt with?
The disease is Myxomatosis, it still exists and won't disappear anytime soon. The government makes sure to introduced rabbits in the areas where the Lynx lives if there aren't enough of them.
Be interesting to know the effects upon many species over the past year of reduced human interaction.
Why do you believe there were less interaction over the past year? Here in CH they reported the change in wild life behavior due to increased interaction with people. Basically the cities were on lock-down so the crowd just went to the mountains.
Well the article does mention hunting and road-kill as some of the causes in the decline, of which both activities would be less prominent with lock-downs in many area's.