And it should be mostly bijective under most conditions. (This is obviously impossible in practice but hashes with common collisions shouldn't be allowed as legal evidence). Also neural/visual hashes like those used by big tech makes things tricky.

The hash in question has many collisions. It it probably enough to get a warrant put it on a warrant, but it may not be enough to get a warrant without some other evidence. (it can be enough evidence to look for other public signs of evidence, or perhaps because there are a number of images that match different hashes)