Your acquaintance is correct. I have a young Egyptian friend who I’ve known for some time who said exactly that. Some of them are there and still support the MB, silently. That young friend of mine is a Christian convert. I feel he would jump at a chance to immigrate to a place where they were not lurking in the background.
The Middle East is full of this. It will take a long time to totally eliminate it.
I am not sure they will ever be eliminated. The people I know are in US they are Egyptian Moslims and the support the MB and are happy with Sharia as is their family in Egypt. They look like integrated Americans.