I have followed this trial to some degree, via news reports and watching some clips online, but have not thoroughly followed this trial, so my perspective may not be fully informed when compared to someone who followed it more closely. Taking that as a caveat, in a civil trial, preponderance of the evidence is the standard, which means that there is more evidence than not. That is what Johnny Depp had to show to win his defamation claim. That the statements were about him, that they were defamatory, and that they harmed his career prospects, and that they were made with actual malice, by someone who knew they were untrue.
Based on that standard, I think that was shown. In the trial, Amber Heard made very clear that she was talking about Johnny Depp in her op-ed, through her own testimony. If untrue, those allegations were defamatory, and he did lose business after the allegations, based on what was discussed at trial. Absolute truth is a defense to defamation, but the problem with Amber Heard's case is that her allegations were very extreme. She alleged repeated, and quite severe physical abuse, on many different incidents. However, the physical evidence appeared not to show the severity of the abuse that she alleged. She appeared to be able to demonstrate a photo that she had a relatively minor bruise on her face, but the battery she alleged at the level of severity she alleged, would have more likely than not, logically, caused much more significant physical damage. Yet, she never was able to show that, despite her frequently taking photos, videos of herself, documenting Depp destroying cabinets, etc. If this evidence existed, it seems logical given her propensity to frequently be cataloguing her life and their relationship, that she would have documented it. The bruise that she did show appeared to have been photoshopped to appear more red and more severe than it appeared in real life, and photos from the next day did not show the bruise that she had as early as the day before. I think one of the most significant reasons she lost this case is that she accused Depp of sexual battery, using a broken bottle, but there was zero evidence of that, and in keeping with the theme, had Depp done that to her, it is logical that there would have been major physical evidence of that. Yet, she never told any of the people who responded to her allegations, including I think the police, that she was abused, and they did not witness evidence of what she stated on the scene.
In addition, she said that she never tipped off the paparazzi to take a photo of her with the bruise, but the paparazzi photographer stated on the stand that TMZ had a policy that unless they had been tipped off prior to her trial date, and that person was able to confirm she would be there, and there would be something to shoot, that they would not have been there. Only someone with direct knowledge of Heard's activities, and what she would be doing, and how she would be looking, would have been able to provide that confirmation. It's not in Depp's interest to do that, since that would be deleterious to his case that a domestic violence restraining order was not warranted, so it had to either have been Heard, or someone in her inner circle that tipped TMZ off.
She also alleged many things in the case, that in some cases, she said that other witnesses would substantiate, but when they testified, they did not, including medical experts, whoever owned the trailer she said was totally trashed, people she said witnessed the abuse, Kate Moss testified and said no abuse occurred despite Heard claiming or suggesting it did, etc.