We know that the Type 052s (112 and 113) have gone through refit/modernization. We also know that the Type 051B (167) has just finished refit/modernization.The 051Cs have not undergone refit as far as I'm aware -- you might be talking about the single 051B (or possibly the two 052s).
Still, your overall point stands.
One or two of the Sovs are currently undergoing refit (136 and 137).
At some point I believe they will do a similar refit to the other two Sovs (138 and 139), and perhaps to the Type 052Bs (168 and 169) to bring all of those "Sovs" up to the same standard.
The Type 051Cs are another matter.
They already have the VLS and decent missiles, the Chinese sensors, the Chinese CIWS, etc. which are the types of things these refits are addressing. They may not need such a strong refit.
Regular maintenance? Yes. Mid-life update? Yes. But perhaps not a need for a specific modernization refit like these others.
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