Answer: Yes it is very likely that they committed a crime and their defense is not valid.
Explanation:
Ignorance of the law is not a valid defense for criminal liability, one can not make an excuse of not knowing a particular law as a reason good enough to commit a crime.
In this case, Goldsmith admitted that he knew that Internet users from around the world were accessing the server to upload and download copyrighted works. This admission can be linked to a mens rea. Which means they clearly knew their act will result to a wrongdoing or crime but still they intentionally continued with it.
Based on these facts, Goldsmith is likely to be convicted of a crime.