There was not only massive amounts of ecological damage due to russian destruction of the Kakhovka Dam (which was a war crime), but also at least 59 people died. This would be impossible at Chornobyl because nobody lives around it.

https://en.wikipedia.org/wiki/Destruction_of_the_Kakhovka_Da...

I'm not saying destroying the chornobyl sarcophagus would be great, but it wouldn't cause the same amount of damage.