I would have estimated 6000t @ 32MW to be ~27kn and 7,050t @ 46.6 MW to be ~29kn.The French Aquitaine class is 6000 tons displacement and has 32 MW (CODLOG) propulsion power at high speed. Its top speed is 27.5 knots.
The Horizon class frigates are 7,050mt displacement and have 46,6MW turbine power (CODOG) for high speed dashes. Their top speed is 29 knots.
I think the vanilla 052D is in the vicinity of 7,700 mt. The stretched version should be around 8,000 mt. Given that they have essentially the same propulsion as the Type 052B, I find the 28kt top speed plausible.
Based on just the examples you gave, 7,700-8,000t @ 60MW only having a top speed of 28kn isn't very likely.
As compared to the Horizon-class, it would have 9-13% more tonnage but also 29% more power. That would imply it is 1kn slower than the Horizon-class despite that difference in power. 29% more power, even with 13% more tonnage, is quite significant. I would fully expect it to be at least 2kn faster than the Horizon with that differential. For it to be slowed to 28kn with 60MW, I think full displacement would need to be above 10,000t.
AFAIK 052D is a CODOG system which means we can just estimate it as a geared transmission system. That makes it even harder for it to hit only 28kn max. The propulsion efficiency ranges for the rest are just too well known. For example, a geared transmission is typically estimated at around 96% and for 052D to be a 28kn'er, that would have to be around 75%. Or for the turbine system to be only ~30% efficient compared to a baseline 38% from LM2500+ which is worse than a LM1500 from the 1955-1960 which hit 33%.
30kn max I could kind of believe. 28kn max is a bridge too far.
You don't have to take my word for it, just try your hand at the estimation formulas like Holtrop-Mennen, Taylor's, etc. and include the appropriate corrections.