Southampton uk systema

Hey guys i hope someone can help me i live in southampton uk and found this site for systema. Im just not sure if hes legit or not. I really want to learn systema but part of me thinks this guy maybe not legit as he says he is choosy about who he teaches and said he is an expat of spetsnaz and he cant discuss who he learned from but he seemed to get very uptight when i asked him where he was trained and accused me of coming to systema paranoid and got very offended but i didnt even say anything offencive just general questions buts its made me suspicious.
I didnt mean to offend him i just wanted to make sure im going to the right place for me.

Hope someone can help and this is the site.
http://ift.tt/2dxGvgq