yes sister, your understanding was correct. So he felt discouraged to embrace Islam, because he thought they were going to cut his manhood. So someone else told him, if you are leaving islam, we are going to cut your head now...
The sheik was trying to highlight the wrong method of trying to explain Islam to non-Muslims. and he also said that circumcision is not obligatory in Islam. You do not have to go through it as long as you clean yourself properly in that area. you can stay as you are and to be Muslim.