Neville ChaimBerlin,
It was in 2015 that the caption of Meron you pasted above is taken from and it was not Breslov chassidim, it just says thousands of Mispallelim are expected there. What actually happened is not reported.
HaGaon HaRav Yaakov Meir Shechter Shlita has now established his own centre and Shul in Uman called Kiryah Neemonah. It is absolutely massive. As to why he did not go in the past nobody can be sure.