I had to Google “מקור חכמה נחל” because I had literally no idea what this post was about.
I think the Israeli government acted responsibly. Going to Uman isn’t being עולה רגל (l’havdil). It’s a nice thing based on the popular Chassidishe minhag of davening by the Rebbe on ימים נוראים. In the midst of a massive pandemic, I don’t think anyone can deny that travel was best left restricted. As we saw, even opening shuls was difficult and many people had to daven outside (or not with a minyan at all!) and even so there was a spike in COVID-19 cases.