It is peculiar that none of those images show a whole radome. Coincidence? But what could they be hiding? It's already visible the pitot tube has been relocated and is obviously placed there only for testing purposes.
That schematic looks far to OLD SKOOL, that's more third gen than fifth gen, it just looks crude, the SAC J-11-15 is a rocketsled by comparison, as I said look for something showing a little more kindred to the PAK-FA, it does bear a slight resemblance to the J-31. brat
I don't believe in any claim about SAC project until pictures of the real thing come up. If SAC can modify a Flanker airframe to the extent shown in the drawings, the company wouldn't have ran into so much trouble back when they were integrating WS-10 to the aircraft.