No.
If you are genuine in your condolences you don't need to post anything about your ignorance. Maybe it wasn't your intention but it looks snide and insincere.
I don't understand the point of a post like this.
If you are genuine in your condolences there is absolutely no need to post that you have no idea who he is. Although surely the video El Pres posted would have given you some sort of a clue...
If you are not genuine then why bother...