I have googled YJ 83 to read more about program. I found link on PDF and you were saying the exact same thing. However this was slightly after posting.There is no such thing as C-803. C-802 series is pretty much equivalent to YJ-83 series I guess, although not exactly the same.
I do think there is supersonic AShm in development somewhere, but I haven't seen any deployment (as YJ-12 or anything else).
I thought I typed in yj 83 instead of C 803, I should have checked post then quickly edited my post.
Anyway I was wondering if it was deployed and if info posted on wikipedia was accurate that it had sub sonic cruising phase then a terminal supersonic phase.