The phrase "actual plot" refers to the main storyline or events that happen in a story, movie, or book. It distinguishes the important and significant parts from other minor details or subplots. Full definition
This episode served as further evidence that the less actual plot an episode provides, the more likely we are to get a full transformation sequence. (100wordanime.blog)
While the trailer was light (and rightfully so) on actual plot points, we did manage to piece together some tidbits regarding how the storyline will fall into place, especially when it comes to the shattered elements Captain America: Civil War left us with. (cbr.com)