Not really, but it is JUST before T1. I would've gone a little more to the inside and check those blind spots if you are. If you are in front of him (and you know it) then you can move so that you can see him at all times in your mirrors.
Now he didn't see you because he didn't look into his blind spot either and therefore didn't see you. Normally when I overtake someone in, or just in front, of a large corner (as that one) I sound the horn to let them know I am there.. It usually goes wrong : >
Anywho, yes he was wrong but think for yourself, is it smart to overtake there? especially in the inside.