Actually, no, making a replacement for the Type 055 hull wouldn't be that surprising. They have the new diesel engines. If the new intercooled gas turbines also become available then it will be possible to make ships with 50% more engine power with the same number of engines.
We are already seeing the Type 054B as the first iteration. 50% more displacement. And I expect a replacement for the Type 052D destroyers to be next. With 50% more displacement the Type 052E(?) would have 11,250 tons displacement and thus be larger than the Type 055. The replacement for Type 055 would be last. A Type 055B with the intercooled gas turbines would then have 15,000 tons displacement. Which would mean it could compete with the Zumwalt hull.
The company which makes the gas turbines for the Type 052 and 055 is already selling 40 MW gas turbines for power generation.
The CGT40 has 42.7 MW power.