Why would Russia blow up the NPP when they're winning the war? This is another atrocity by the Ukrainian military to muddy the waters and try to attract yet more international support like the dam bombing.
causing a nuclear disaster would help with this how?
The plant is located near the front lines, along a probable route to the Sea of Azov. Blowing it up creates an obstacle, making advances and supplies more difficult.
When you hold part of your opponents country that means you’re winning.
That's a stretch. Like Germany was winning WW2 until it was kicked out of France.
True, it's probably the best Russia can achieve but far from their goals. And they've been losing ground steadily now.