Reports of someone moving a mountain that are not present in Catholic scripture are likely to fall in the category of “unapproved private revelation” and hence are off-limits as a discussion topic for this forum.
Having said that, I reckon if God wanted to work through someone to move a mountain, He could and would do so, and there is no requirement that he choose a Catholic for this task.
i doubt that Catholics think very much about purported miracles from other faiths, since we are not required to believe in them and it’s frankly not important to the vast majority of us. We do not look to miracles to prove that our Catholic Church is correct in its teachings, and we would not take a miracle happening to someone of another faith as meaning that their faith is correct and ours is not. We would simply say that God works where and through whom He wills.