Once again Dutchboy, what you refer to as “demonic” is a Church-approved private revelation/apparition. Since the authorities of the Church have found La Salette (and other apparition sites) worthy of belief, we Catholics really have no need of your approval nor do we seek it.
You are not the competent authority to judge the worthiness of an apparition site or a private revelation. Thus, I don’t care what you think. You’ll just have to live with it.
All the same claims have been trotted out with Medjugorje and several others. Even your gang eventually called that a fraud. Continue to cling to such dreams and illusions if you must. The believers in Christ, alone, will continue to look only unto Him. We don’t need superstitions or vain imaginings to recognize our rescue. And, I’ll be happy to live with that.