@criver
Good riddance as far as I care. Eren had made effectively no progress in as a character in like 100 chapters, and if a time skip is what it took, so be it. Same shit with Vinland Saga's anime. The child version of Thorfinn was insufferable, and a timeskip remedied that. At least in both cases the changes were sensical and can be explained, even if the time skip was lazy in some sense.
@AnonDePlume
Considering it's affecting the timeline, IMO, it qualifies. It's pretty much the exact same shit as Stein's Gate's version of time travel, and no one questions whether or not that is time travel.
Anyways, that's another good hint for it, but it's still bringing in a shit ton of problems associated with time travel, and overall seems to be lazy. Foreshadowing doesn't necessarily make a development reasonable or acceptable. A certain Game of Thrones comes to mind.