I think in that case the prosecution was so shell shocked that a jury would believe such a ridiculous story - that a hypothetical towel touched by the defendant 5 months earlier in a third parties house - would wind up in the murder house and then coincidentally be used by the killer to clean up the crime scene. And the killer would wipe away all his dna but leave the defendants left on the rag. And that explains like 10 instances or more of DNA transfer, not one or two, many cases in multiple parts of the room. And that the victim took a plate from a third parties house that just so happened to have the defendant's blood on it.
Here the facts are much much different. Here, you only need to believe in the possibility that the technicians were messing w material that had RS DNA in it and the examined the bra clasp. Given the dirtiness of the room, the dirty gloves, the fact that over 20 experts said contamination was a possibility and that there were over 50 violations of protocol (including 2 independent experts) - that is a much much different case that a defense lawyer merely raising the possibility in closing argument without any experts backing up his claim of contamination. Or believe in the possibility given over 50 violations of protocols, that gathering of other evidence was also contaminated. Moreover, here there are 2 cases of transfer not multiple, and perhaps just 1 because there is no evidence that was even the murder weapon