they don't but they are more correct than what others have predicted. Some of their predictions can be compared with structures determined with x-ray crystallography
>>seydor+(OP)
did they come up with their structures independently of the x-ray crystallography, or was that part of a ML dataset for predicting structure
>>cupofp+p2
The casp competition that they won consists of a bunch of new proteins, the structures of which havnt been published. So the test set is for brand new proteins in that case.