The judge asked them to drop all the patent claims, even the one that Google claims Uber is still using/infringing, which means it's unlikely to be related to whether or not Uber was or continues to infringe on them and more likely to be related to the strength of the patents themselves. A lot of patents get invalidated during cases like these...
"Likely to ne related to the strength of the patents" means that the patents have been scrutinized by the court and determined to be invalid. But that is not the case.
