For something 2018, he could not have possibly seen the new radar on the Type 075 and on the testing ship 891 before then, so he made a smart call on the dual backed dual band rotating radar on the back. But a phase array in one side and a slotted array on the other? S-band on one side and L-band on the other side.
The PLAN doesn't seem to be great fans of using L-band radars on the ship, and the number of L-band naval applications in the world is going down, namely left to the legacy SPS-49 radars in the USN and most of all, to SMART-L/S1850 applications in the EU navies and RN respectively.. While there are L-band applications in the PLA's SAM forces, L-band radar use in the PLAN is nonexistent and its not going to start now. I also get the impression that his L-band panel is a bit too small.
Also, the Type 364 replacement is turning out to be an S-band/X-band combination with a range of up to 350km on the S-band and over 100km on the X-band, as per new "Type 383" on the Type 075. I do have some doubts that its an S-band/X-band combination, as I prefer to think it might be a C-band/X-band combination instead given the size of the larger array of the two and in relation to the panel sizes of the Type 382 S-band radar used on the 075 and 054A, as well as both carriers.
His use of three sided X-band radar arrangement instead of four is to be commended. Why three instead of four? Cheaper that way. Unlike other fan designs, he is cost minded in his design which is unusually considerate for fan designs.
Cost --- determining how much the PLAN is willing or not willing to spend on the ship --- is what makes predicting the next generation Chinese frigate a bit more difficult. You can have a low end or a high end frigate design, particularly when it comes to the sensors and the systems.
I for one, might think that both radars --- the one spotted on the Type 075 and the one spotted on Test ship 891 --- would both be on the 054B, with the larger radar on the primary front mast and the smaller radar on the secondary aft mast. That parallels the current 054A arrangement with a primary search radar followed by a secondary search radar. Then below the larger radar is an integrated mast, with the new X-band radars from the 055 fixed on four sides, with CEC panels on top of that radar and IFF strips below.