2. "one of the ... most toxic space derelicts ever to crash to Earth"
I wonder what sort of toxicity is being referred to here.
The spacecraft does contain a few ounces of plutonium, which might be dispersed in the air, or it might survive the trip through the atmosphere and contaminate the land or water where the parts of the spacecraft end up.
There are also tons of ordinary liquid rocket fuel & oxidizer; these chemicals are often described as toxic, but they probably burned up in the atmosphere.