Yes this limited missiles load especialy in Asia can be surprising but almost all Missile Boats don' t have TL and even sonar in more small radars with a enough short rangeI don't know about weight but looking at that photo there should be enough space for the 056 to have 6-8 AS/ShMs where it only has 4.
I also wonder if the 022s can carry the torpedo ASM and relay targeting info from the 056s as the 022 with its larger 8 missile capacity can better "afford" to carry a mixed missile load.
Analysis : Are Missile Boats Still Relevant in Modern Warfare ?