Definitely looks like there is more compared to the original J-15, I’d expect J-15T to have a similar arrangement.
Of course, no indication whether this actually saves weight compared to the original J-15 or just mitigates weight gain, after all they added a ton of new systems to the newest J-15s and this is a two-seater as well.
TVC has been evaluated by the PLAAF when Su-35 was participating in DACT with other domestic Chinese fighters, the conclusion was that a good IR missile + HMD combination was more useful than TVC in WVR dogfights. PL-10 is a better IR missile than R-73 and the J-10C was able to achieve a positive K/D ratio versus the Su-35 with it.
Also, TVC engines was also found to be costly to maintain and also reduces the absolute amount of thrust of an engine. PLAAF and PLANAF now want engines that provide more absolute thrust so that their fighters have a higher thrust-to-weight ratio rather than supermaneuverability.