That's just it, though. The "change in direction" cited was them announcing it as a two-part movie, which we don't know wasn't already the case since, as I said, they never announced Infinity War as a single movie. Most of the other plot points that tend to get cited as proof of stealing Snyder's ideas (the hero sacrificing himself at the end, an older hero mentoring a younger one, heavy use of time travel, a finale involving a massive clash between two armies) are all either things that were already present in Marvel's comics or just tropes that are super common in fiction already.
Logan also involves an older superhero forming a bond with a younger one and then sacrificing his life at the end for the greater good. Were they also ripping off Snyder's 5 film arc?