I'm not going to accuse the OP of lying, but this definitely looks suspicious to me. We don't even know if that person really is an expert...
Does it matter if he is expert? He is not charging any money for it, if you do not like the lessons, you can always stop later. How many experts or master do you know that is willing to offer lessons for free?
I'm not going to accuse the OP of lying, but this definitely looks suspicious to me. We don't even know if that person really is an expert...