While windmills do kill birds (not many, see above), not a single whale has been killed by offshore wind turbines. However:
"Since late 2022, anti-offshore wind groups have weaponized incidents of whales washing ashore on beaches along the East Coast. A growing network of anti-offshore wind actors with documented ties to the oil & gas industry has been swift to exploit these tragedies," even though it's ships that kill the whales.
https://climatenexus.org/climate-issues/offshore-wind-whales-disinfo/