This article isn't entirely accurate. Trials will still require playing with other characters, and the three 24-person Crystal Tower raids that are a requirement for progressing the story also must be played with other people.
Article only mentions dungeons. Did they add it for story trials too? As far as I know that's only available for early 4-player trials and a couple of very recent additions. The Chrysalis, Steps of Faith, etc can still wipe a group of human players easily if their mechanics are ignored.